Top Definition
The expression ‘you know what’ is when one may say to another to get their attention, in a conversation. One may say this expression several times throughout one conversation to ensure they still have the attention of those participating in the conversation.

‘you know what’ also is when your stating to someone about something there not aware of , or when someone constantly pays them out they use the expression.
Example
Your outfit looks like your going clubbing not to work!
‘you know what’ no one likes you!
by NATASHACAR January 13, 2011

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Frustrated response to something said. Passionate as well.
You know what?!!!! That ain't even right what you just said!
by GloJaz July 08, 2015

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt