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1.
when ur ass is hairy, sweaty, and moldy and has acne from cheek to cheek.
hey crusty crack! wash ur ass!
by unisha February 14, 2008
 
2.
when you either shit urself or u don't wipe ur ass and it crusts over creating a hard brown surface of shit (it usually covers ur asshair)
after john had an assplosion in my ass, i did not wipe it off and i got a crusty-crack
by DAVEYWAVEer January 25, 2003