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.
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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Merriam-Webster unabridged
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