PMFL 

used in msn conversations, stands for piss myself fucking laughing

Fred "yeah then i went flying over the wall"

Jeff "PMFL, ahaha fail man"

PMFL by thelaughingwoman May 25, 2009

PMFLFOTF

Pee Myself From Laughing Fit On The Floor

When He told me he smelled like fish, I PMFLFOTF'd

PMFLFOTF by doggy=) March 21, 2008

pmflw 

Abbreviation for Punk Muthufuckin Lightweight

Tom: Dude where was Jim last night bro?

Pat: Jim stayed in to study for his Bio final. What a pmflw.

pmflw by Ivan Yerkinoff July 4, 2007