you know what?

idiom

Definition of you know what? 

(Entry 1 of 2)

informal

1 used to emphasize the statement that comes after it You know what? I never trusted her.She lied to me again, but you know what? I really just don't care anymore.

2 used to get someone's attention Hey, you know what? I'm hungry.

you-know-what

noun

Definition of you-know-what (Entry 2 of 2)

informal

1 used in speech to refer to something that is not named but is known to both the hearer and speaker I've hidden the you-know-what in the closet.

2 used in place of a rude or offensive word in order to express anger or annoyance He's a complete you-know-what.

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living or existing for a long time

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