Top definition
A very annoying, itchy feeling that one gets when they don't wipe their ass properly/completely. Sometimes you can wipe until there's no shit left but still suffer from this condition. Oftentimes this condition comes involuntarily and is not usually a result of lacking anal hygiene.

One way to counter-act this feeling is wiping with a wet cloth.
I had explosive diarrhea earlier today and it was impossible to wipe. I thought I got it all but the itchy sensation in my crack foretold of my incoming crusty ass.
by anus_ganus November 01, 2014
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2
Dried up shit that gets smeared arond the ass and drys the next level up from winnets
I got so wasted last night i woke up with a crusty ass
by carl richie August 11, 2007
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