Sexy and I Know It 

The most recent LMFAO music video. Focuses around the male ballsack in a speedo jiggling around and getting bitches. Great video. Also features pornstar king Ron Jeremy.

Red Foo: Hey did we finish "Sexy and I know iT"? i Was too tired from getting ass

Sexy and I Know It by IMSEXYANDIKNOWIT019 November 18, 2011

I'll let you know

The phrase that someone uses when they're never going to tell you shit.

Friend 1: Hey, are you free this week?

Friend 2: I'll let you know.

*Never talk to each other again.*

I'll let you know by Brownie72 December 26, 2011

You know 

An interjection, most often used when saying something the listener does not, and often could not reasonably, know.

There are 374,102 hairs on my head, you know.

You know by Anonymous May 25, 2004

you don't know me! 

The famous line on Jerry Springer, Maury, etc.

Jerry: Let's bring out the fat and ugly sluts!

*JERRY,JERRY, JERRY!*

Sluts come out screaming, "You don't know me! You don't know me!" while audience is booing with disgust.

you don't know me! by Carlito October 6, 2004

we know mason 

phrase used to get access to places that normal people usually dont have access too

The man got into the club by saying "we know mason" to the bouncer

we know mason by Tim May 7, 2005

Fuck if I know 

When you have no idea what someone is asking you you should reply with this

girl: what time do you get off work?
guy: Fuck if I know

Fuck if I know by OG March 31, 2004

I dont know, I'm not a Doctor 

A sarcastic reply to a very obvious statement or situation.

Gerry: So you stayed up all night eh?
Phil: Yep and I feel really sleep deprived.
Gerry: Really? You know I heard sleep was a good way to treat sleep deprivation, but again I dont know, I'm not a doctor. I might be wrong.

Andrew: Hey look! It's raining outside!
John: Yea I heard it tends to happen every once and a while....but again I dont know, I'm not a doctor so don't take my word on that.

I dont know, I'm not a Doctor by Owen Finnegan June 11, 2007