DYK

Acronym for "what do you mean", used as a one-word reply when somebody's post is confusing, surprising, or appears to be obviously wrong. Often functions as feigned-shock rhetoric rather than a real request for clarification, especially when followed by punctuation: "wdym?", "wdym wdym wdym".

I Don't Know. One of the most-used texting abbreviations.

(internet slang, text messaging) Or you know why.

"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.

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.