or series of farts that occur immediately before defecation
(or taking a dump). These farts smell
much worse than regular farts because your poop
is at it's closest point to the outside of your body.
Dude1: Dude, what is that horrible smell?
Dude2: Sorry dude, it was a predumptial fart.
Dude1: I think you need to go sit on the toilet!