Definition of you know what?informal
- You know what? I never trusted her.
- She lied to me again, but you know what? I really just don't care anymore.
- Hey, you know what? I'm hungry.
: to perceive directly : have direct cognition of
: to have understanding of
: to recognize the nature of : discern
used as an interrogative expressing inquiry about the identity, nature, or value of an object or matter
often used to ask for repetition of an utterance or part of an utterance not properly heard or understood
: in what respect : how
used as an interrogative expressing inquiry about the identity, nature, or value of a person, object, or matter
: how remarkable or striking for good or bad qualities
What made you want to look up you know what?? Please tell us where you read or heard it (including the quote, if possible).