Definitions by Dr. Gertrude

Buttsack 

A puss filled pouch of skin found in anus or on the buttocks of grown men, used by rodents (usually mice or rats) for nesting, burrowing, gathering, ect.

I set a mouse trap in my cousin's buttsack in an attempt to catch dinner.

Buttsack by Dr. Gertrude March 15, 2011