Top Definition
The crusty brown material that gets transferred to the rear of the toilet seat or underwear, resulting from the accumulation of fecal matter at the top of an unclean, too-far-rear-wiping person's ass crack.
I almost sat in the hefty butt smudge that you left on the seat!
by Etch August 15, 2006
2 more definitions
after 'releasing' waste products, the part that 'hangs on'. also an insult to persons of idiotic disposition.
'you dropped that expensive glass! - you butt smudge!' or 'ewww...my undies are stuck to my butt...it must be that little be of butt smudge left'
by mel p November 30, 2004
physical proof against a wall that a couple committed adultery in a baby nursery
Craig totally cheated on Holly J with Manny! I mean danng, check out the butt smudges on the wall.
by omgitskee June 01, 2011

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