You should know. The opener used in Reddit's r/YouShouldKnow community, where users share useful life tips, warnings and bits of practical information they think more people ought to be aware of. Functions like a friendlier, more advice-flavoured cousin of TIL.
YSK that most painkillers are far less effective if you wait until the pain is severe to take them.
Add your own interpretation of "YSK".
Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
See all Internet & Memes slang on Slangora.
Browse all slang words starting with Y.
Today I learned. The signature opener of Reddit's r/TodayILearned community, used whenever someone wants to share a fact, statistic or piece of trivia they've just discovered. The format has spread off-platform and is now a generic way of flagging "here's something I didn't know until just now".
A useful piece of advice.
An internet slang and text messaging abbreviation with two common readings: You Know Who (used to reference someone without naming them, often in gossip or secret-keeping) or You Know What (used to introduce a statement obliquely). The ambiguity is usually resolved by context. Primarily used in informal digital communication among people with shared reference points. The deliberate vagueness of YKW is sometimes its entire purpose — saying ykw without specifying invites the listener to fill in the blank themselves.
"If you know, you know." An inside-joke disclaimer for references only a specific subculture, friend group, or fanbase will get. Used to signal that the speaker belongs to the group without explaining anything. Doubles as a quiet flex.