recherchez un mot, comme blumpkin :
 
1.
a stained anus, kinda browner than you think it should be...maybe even a dingle-berry or two present. Rhymes with anus.
Biff: Hey Blaine...that chick I banged last was awesome. But, when she bent over and pulled her panties off, I saw her stainus! It was rotten. But, I did her anyways.
Blaine: Did your tool smell like ass?
de saintsfanmd 10 juillet 2008
 
2.
anal leakage resulting in a shit stain on your pants, common among old bastards and sluts with loose back doors.
1:Dude you need to talk to your mom about that stainus. 2: I can smell that stainus from over here.
de Rocco Cocko III 8 mai 2010