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Said in agreement to a statement or question. See word
-Thats a massive spliff you just rolled
-You know it
by Stoner 04231 November 25, 2003
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simply the greatest three words you'll ever hear. the magic password to quickly get you out of any situation.
must be accompanied with a twisted right leg kick across the left leg as the left arm comes twisting across the body in a punching motion. when performed correctly, everyone will know it.
1. b: did you see that guys leg kick?
j: you KNOW it!

2. b: did chuck norris just get eaten by david hasselhoff?
j: you KNOW it!

3: g: is that a herpes bump?
j: you KNOW it!
by brianisgay January 20, 2006
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Originally coined by Frank The Tank (Will Ferrell) in the movie Old School, this phrase is now running rampant in college campuses across America. Can be said in agreement to a statement, or in answer to a question. Also at random times if you're bored.
1: F: Awesome... YES! I am back. Woo! You KNOW it!

2: A: This Karkov tastes really good.
J: You know it!

3: D: Dude, did you just pass me in Mario kart?
B: You know it!

4: J: God I'm wasted... YOU KNOW IT!
by JK February 08, 2005
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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!
by Jorge, aka Nimbo October 27, 2008
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