I coined the term in my 1992 Fantagraphics comic of the same name. So back off slang stealers. It is named for an ass tampon made of toilet paper which looks like a biscuit when molded by the butt. It is not a name for a turd.
by Dean "buttons the chimp" williams May 25, 2003
 Get the butt biscuitmug.
Get the butt biscuitmug. by bob May 9, 2003
 Get the butt biscuitmug.
Get the butt biscuitmug. by indian guy February 2, 2009
 Get the Butt Biscuitmug.
Get the Butt Biscuitmug. A crap.
by -Mikey Griffiths, King Of Wales- February 12, 2003
 Get the Butt Biscuitmug.
Get the Butt Biscuitmug. The name of the little submarine in Markiplier's video, SOMA Part 3. Possibly also something disgusting
He's my little bubble butt biscuit *grutural noises* I don't know what a bubble butt biscuit is but I'm not sure I want to know.
by JFox December 7, 2015
 Get the bubble butt biscuitmug.
Get the bubble butt biscuitmug. by Heather Banks June 12, 2008
 Get the Butter Butt Biscuitsmug.
Get the Butter Butt Biscuitsmug. by megryan July 4, 2008
 Get the baking butt biscuitsmug.
Get the baking butt biscuitsmug.