A pile of shit.
"Thats a big pile of stinking butt rubble"
by shootingoon August 26, 2008
1 more definition
The detritus of toilet paper left on the bathroom floor (or in one's clothes) after using the bathroom.
The floor of their bathroom was covered in little pieces of butt rubble and hadn't been cleaned in ages.
by Petersworld May 30, 2011