1. You Know What - Pronoun
2. You Know What - Phrase
you know what
(idiomatic) Used, often as a question, to get someone's attention before announcing something.
Synonym: you know something
you-know-what
The name of something the speaker does not want to mention, but which is known, or very likely to be known, to the listener. It can be plural (as in "... the you-know-whats").
you-know-what
At the center of your being you have the answer; you know who you are and you know what you want. Laozi
You have brains in your head. You have feet in your shoes. You can steer yourself any direction you choose. You're on your own. And you know what you know. And YOU are the one who'll decide where to go... Dr. Seuss
Do you know what it means to come home at night to a woman who'll give you a little love, a little affection, a little tenderness? It means you're in the wrong house, that's what it means. Henny Youngman
If you know what a dollar is worth, try to borrow it. Portuguese Proverb
You know what to say, but you do not know what you might be told. Maasai Proverb
Never take a wife till you know what to do with her. Scottish Proverb