Stands for "Pissing In Pants Laughing". An internet term, usually used when someone finds something very funny.
Dude1: Check this pic out!
Dude2: pipl!

Girl1: See that guy over there? I think he wants me.
Girl2: lol noob pipl
by Xp4nd3r May 11, 2006
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Peeing In Pants Laughing

Used when someone finds something very funny
Person1: You got skills dude!
Person2: That's what your mom said last night!
Person3: PIPL!
by erwinnnn January 17, 2009
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