An ass scab is a person with asshole friend/spouse that trys to fix the problems/situation the ass has caused
Ass: wtf you are mcdonalds and you are out of cheese burgers? Friend/spouse: im sorry he/she is being an ass. McD's worker: dude im already angry dont try to be an ass scab for that ass
Doing somthing that is likely to result in getting your butt wipped with a stick or belt to the point of developing blisters.
You know little Johnny, you're breeding a scab on your ass by not get your home work done.
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Noun: when someone has hard sex so hard their ass has scabs on it
I gave that girl over there a scab ass a while back