The Who Farted
Poop'l Jam
nUmber2
Stooly Dan
Grateful Dumps
Black Eyed Pees
Peenk Floyd
...and, with no alteration whatsoever...
Isaac Hayes and the Movement
Bonus:
REM apparently originally called themselves Can of Piss, which...well, I guess they win.
Meanwhile, I'm going to go wash up after so many attempts at inappropriate humor.