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3. PSF
Pre-shit fart. A fart released shortly before taking a dump. Extraordinarily foul-smelling as a result of passing through a colon full of shit. Creates a warm or burning sensation in & around the anus when released.
"Dude, that PSF you just ripped was so nasty. Why don't you go to the bathroom and shit already?"
1. PSF
To PSF someone is to pull an awesome prank on them, usually in the form of hilarious teamkilling in online games.

Originated from the Steam clan The PSF, "Petrol Station Flowers", and their crazy antics.
Did you just kill Baz with his own exploding barrel?
Yeah, classic PSF.
2. PSF
Acronym for Porn Star Finish. When a prostitute allows someone to cum on her face or body like a porn movie instead of cum inside her.
Most guys will do just about anything in exchange for an energetic, wet, sloppy blow job with a PSF.
bbbj cim cif cof cob
by AndyRBR Dec 30, 2005 add a video
4. PSF
Acronym for Potential Swine Flu. This refers to catching Swine Flu by hooking up with a fat chick. The chick herself would be referred to as the PSF.
That chick is a PSF. Stay away unless you want to catch the Swine Flu
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