Ass Crack 

1) The vertical line dividing the left and right ass cheeks.
2) Crack, and cocaine variants, that were at any point, up someone's ass.

1) The morbidly obese man's ass crack was showing. All of the children saw it.
2) Junkie: Hey, wanna smoke this crack with me?
Bum: Nah, nigga, that crack is ass crack.

Ass Crack by DumbCumBumWhoPissesAndShitsRum April 12, 2017

ass crack 

The split between someone's ass cheeks.

Look at the size of that guys ass crack! It runs halfway up his back

ass crack by Big Bad Bastard November 14, 2002

ass crack 

the line on your ass that gets erased after sitting down for long periods of time.

I better take a marker to re-draw my asscrack because it will be gone after sitting in the plane that long

ass crack by Frank Bertossi September 15, 2005

Ass crack 

The thing you yell when nothing else comes to mind. One of those times when you're so mad that you say something extremely irrelevant and that doesn't even make sense, when you could have just as easily said ass hole.

Tracy: Yeah, thats such a dumb thing to say no one cares.
Sam:Oh.. You...You're such a... a...
Tracy: A what?
Sam: Ass crack!!
Tracy: lol of all the things you could have said...ass hole maybe?.. wow you are just awful.

Ass crack by wellblowmedown April 11, 2011

ass crack 

a line on your butt

put your hand on your back and go down about 5 inches and thats your ass crack

ass crack by Kinsley June 3, 2003

ass crack 

The crack of your ass also known as the anus (you know where shit comes out of)

Yo man your crack smells worse than Nick's body odor!!!!!!!!!!

ass crack by Vanilla_Ice January 26, 2005

ass crack 

An exclaimitory statement used to express frustration.

Some dickhead cuts you off in traffic. Instead of resorting to road rage, you shout at the top of your lungs..."ASS CRACK!"

ass crack by Big Dick McGee August 26, 2003