What is You Know It!?
1.
To totally disregard what someone is saying or said, and just agree with them completely whether or not they're right.
Example 1
Guy A : Sometimes I wonder if I should even be alive...
Guy B : You know it!
Example 2
Wife : Honey, I'm pregnant, and I don't think it's yours..
Husband : You know it!
Example 3
Guy A : Should I get a...
Guy B : You know it!
Guy A : But you didn't even let me finish...
Guy B : You know it!
See
