A shitbrick in your underpants.
When you shit your pants at age six, were too embarassed to tell your mom, and walked around stinky all day with a pant biscuit.
by Lacey Lou October 18, 2003
When you try to force a fart and get a surprise. A little crapnugget.
*grunts* Aw, crap! I just pinched off a pant biscuit!
by Tak a Lah August 29, 2003