The act of eating a ass with chunks of fecal matter or shit stains all along the crack of your partners ass. After completing the task you have officially earned your brown badge of courage. You sick bastard.
Another term for butterface (see definition) where the chick is hot except that if her face were a weapon, it would be a harmful one (she's ugly) but you are drunk and she has a nice body, and you want some 'nanny, so you put a bag over her head...it's the degrading trade off we give women for allowing them to vote.