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2.
A woman's oversize buttocks.
Maria's pants are way too tight for her slugbutt.

That woman has such a big slugbutt I could rest my drink on it!
by Stefen S. July 16, 2006
 
1.
refers to a situation during which as slug co-exists in a symbiotic relationship with slug-like host inhabits said host's butt in a mysterious circumstance
he is got to be slugbutt
by Ln(x) March 03, 2010