HN slang refers to the informal shorthand, memes, and acronyms that flourish on Hacker News, a technology-focused forum run by Y Combinator. These terms compress complex ideas into a few letters or playful phrases, allowing veterans to exchange nuance without cluttering the discussion.
Knowing the slang is the fastest way to spot sarcasm, signal in-group knowledge, and avoid rookie mistakes that can tank your karma. This guide breaks down the essentials so you can read threads with confidence and write replies that sound like you belong.
Core Vocabulary
AFAIK, IMO, and IANAL
AFAIK stands for “as far as I know” and softens statements that might otherwise sound absolute. It signals humility and invites correction. IMO (“in my opinion”) does similar work but emphasizes subjectivity, while IANAL (“I am not a lawyer”) warns readers that legal advice is off-the-cuff.
HN and OP
HN itself is shorthand for Hacker News when users are referencing site culture or moderation quirks. OP means “original poster” and is used to refer back to the person who submitted the story or started the thread. These two acronyms appear in nearly every comment section and are safe to use from day one.
TL;DR
TL;DR stands for “too long; didn’t read.” Users drop it at the top of a comment when they plan to summarize a lengthy article or their own wall of text. Skipping the TL;DR is considered poor etiquette when your comment runs past three short paragraphs.
Memes and Cultural Markers
Show HN
“Show HN” is a prefix for posts that present a personal project, startup, or weekend hack. It invites feedback, bracing the poster for both praise and brutal critique. Adding this prefix is the only culturally accepted way to self-promote without appearing spammy.
HN Hug of Death
The “HN Hug of Death” describes the sudden traffic surge that crashes a small site linked on the front page. Veterans will warn newcomers with comments like “brace for the hug.” Mentioning the phrase signals you understand both the blessing and the curse of going viral on the platform.
Bikeshedding
Bikeshedding refers to long, heated debates over trivial details such as color schemes or variable names. The term originates from a famous parable about a committee spending hours on a bike shed while approving a nuclear plant in minutes. When someone accuses the thread of bikeshedding, they are urging everyone to refocus on the bigger picture.
Upvotes, Downvotes, and Karma Etiquette
The Karma System
Karma is a running score that rises when your comments or stories receive upvotes and falls when they are downvoted. High karma unlocks extra features like the ability to downvote others. However, karma is viewed as a side effect of good discussion, not a goal.
Gray Comments
Comments that dip below a karma threshold appear in light gray, signaling community disapproval. A grayed comment can recover if later readers find it insightful. Users often edit or delete grayed posts to avoid a permanent stain on their profile.
Self-Downvote
Experienced users sometimes downvote their own comment if they realize it was off-topic or factually wrong. This act earns quiet respect and shows humility. Newcomers notice the gesture and often follow the example, keeping threads cleaner over time.
Story Submission Language
Title Tweaks
Submitters often append or prepend tiny clarifiers to headlines. Examples include “2019” for old articles, “PDF” for academic papers, or “video” for talks. These tags set expectations and reduce click-through disappointment.
Dupe and Dang
“Dupe” is shouted when a story has been posted recently, prompting moderators to merge threads. “Dang” is shorthand for Daniel Gackle, a lead moderator, and is used when asking for an edit or removal. Both terms save space while alerting the right people.
Paywall and Soft Paywall
Users flag articles behind hard paywalls with “paywall” in the comment. A “soft paywall” label is used when an article allows a few free views. These cues help readers decide whether to click or move on.
Comment Patterns
“This.”
Posting a single word—“This.”—is a quick way to endorse the parent comment without adding noise. It is often followed by a brief sentence that expands the point. Overuse dilutes impact, so veterans ration it carefully.
“Came here to say this.”
This phrase signals agreement while admitting you arrived too late to make the point yourself. It is tolerated once per thread but panned if repeated. A safer variant is to add a new angle after the admission.
“Source?”
“Source?” is a terse request for citations. It can feel blunt, yet it keeps discussions evidence-based. Providing a link without snark is the smoothest response.
Advanced Nuances
Subtweets on HN
Sometimes a comment will reference “a certain orange website” or “a forum we all know” without naming HN directly. These inside jokes wink at readers who recognize the meta-commentary. They rarely add substance, so use sparingly.
Flagging vs. Vouching
Users with enough karma can flag a story as off-topic or spam, hiding it from most views. Others can “vouch” to restore visibility if they believe the flag was unfair. This tug-of-war keeps the front page curated without moderator overload.
Dead Comments
Comments killed by software or moderators appear only to the author and to users with “showdead” enabled. Some users browse dead comments to learn what not to do. Treating dead space as a learning lab accelerates cultural fluency.
Practical Tips for New Users
Lurk Before You Leap
Spend a week reading without commenting to absorb tone and etiquette. Pay attention to which posts earn high karma and why. This silent apprenticeship prevents early blunders.
Use Clear Handles
A recognizable username builds reputation over time. Avoid disposable throwaways unless privacy demands it. Consistent identity invites thoughtful replies and private messages that enrich the experience.
Edit Ruthlessly
HN allows edits for a short window after posting. Trim fluff, fix typos, and sharpen your thesis. A well-edited comment ages gracefully and often gains late upvotes.
Common Pitfalls
Overpromoting Your Product
Posting your startup more than once every few months risks backlash. Frame updates as learning journeys rather than marketing pitches. The community rewards humility and punishes hype.
Starting a Flame War
Snarky one-liners about rival tech stacks ignite long, off-topic battles. If you must critique, offer data or firsthand experience. A measured tone keeps the focus on ideas, not egos.
Ignoring the Guidelines
The site has a short, plain-English guideline page linked in the footer. Skipping it is like ignoring the readme of a codebase. Read once, bookmark, and revisit whenever you feel friction.
Hidden Gems
Ask HN
Prefixing a post with “Ask HN” turns it into a community Q&A. Popular questions range from career advice to debugging obscure errors. Answers often come from founders and senior engineers who rarely post elsewhere.
Launch HN
Y Combinator startups can schedule a “Launch HN” thread, a moderated AMA that replaces the typical Show HN. The format encourages deeper technical dives and honest metrics. Even non-YC founders learn by observing these sessions.
Hiring and Who Is Hiring
On the first of each month, “Who Is Hiring” threads aggregate job openings from hundreds of companies. Job seekers post in “Who Wants to Be Hired” with a short pitch. These threads bypass recruiters and create direct, high-signal matches.