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.
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The hole in the lower backside of a person.
" Yo man i stuck my dick up dat bitch's ass crack
by P.I.M.P November 29, 2003
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Look at the size of that guys ass crack! It runs halfway up his back
by Big Bad Bastard November 15, 2002
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Putting the crack of your buttocks on linear property.
Joe: Don't you hate it when people are Ass-Cracking the poles on subways?
by Shohn Shmoe February 22, 2012
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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
by Frank Bertossi August 20, 2005
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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.
by wellblowmedown March 25, 2011
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put your hand on your back and go down about 5 inches and thats your ass crack
by Kinsley June 3, 2003
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