Top Definition
Crusty Butt consistantly follows mud butt, it is the dry doo doo build up in the anal region of the buttocks, this usually occurs 45 minutes to an hour after defication.
I failed to wipe good after my diarrheal explosion i had in the bathroom 45 minutes ago and now i have crusty butt, I am very uncomfortable.
by Michael Riley April 06, 2006

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