Bump
Bump is a one-word forum reply posted to push a thread back to the top of a message board index. The slang was already familiar to internet users by 2000 and became standard shorthand across phpBB, vBulletin, and Chan-style imageboards throughout the decade.
Overview
Bump is a one-word forum reply posted to push a thread back to the top of a message board index4. Most forum software sorts threads by most recent post, so adding any reply, even just the single word 'bump,' resurfaces the discussion for other users.
The term works as a verb ('I bumped the thread'), a command ('bump'), and a noun ('needs a bump'). On imageboards like 4chan the mechanic matters more, since threads without replies eventually get pruned. Some communities accept bumping to remind readers of an unanswered question, while others treat pointless bumps as spam3.
How It Spread
How to Use This Meme
To bump a thread, post a short reply, typically just the word 'bump,' in a discussion you want to resurface. Because most forum software orders threads by most recent post, the reply pushes the thread back to the top of the index. Common conventions include only bumping your own thread, waiting a reasonable interval before doing it again, and adding a real question or update rather than a blank reply on forums that discourage low-content posts.