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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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2
The split between someone's ass cheeks.
Look at the size of that guys ass crack! It runs halfway up his back
by Big Bad Bastard November 14, 2002
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3
can be used to indicate the time of day being excruciatingly early.
You going out tonight, Bill?

Nah man, I had to be up at the asscrack of dawn this morning.
by 556boyer June 04, 2011
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5
when a girl wares her paints to damn low and you can see the "V" that is made where the two butt checks come together.
Britney Speares has way to much asscrack
by Jane Doe December 14, 2003
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6
A dirty, despicable human being, that serves no purpose in life. Only there to annoy the shit out of you.
-Damn, I'm so tired of Denise bothering me.
-Yeah, that girl is such an asscrack.
by Superstar88 March 08, 2008
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7
A person who is not quite an asshole, but well on their way.
Steve gave me a back handed compliment. That guy is such an asscrack!
by missikat November 29, 2008
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