Pfvoom 

"PFVOOM" is the onomatopoeic spelling of the sound that is made when you blow across the top of a bottle.

*Blows across top of bottle*

PFVOOM

Pfvoom by MushroomWithEyes January 8, 2010

pfoomf 

acronym for: Poopy Fat Old Ogre-like Mother F***ers. used on AIM to make fun of someone, usually a loser so they won't understand what you're saying.

dude, those guys are suck a pack of pfoomf.
i know, they bug me so much.

pfoomf by Sir Callahan February 13, 2007