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1.
PPU
Acronym for Please Pick Up (PPU), often used in www.craigslist.com or other classified ads.
The advertisement for a "Free Sofa - PPU" indicated the item is available for pickup anytime.
by Jason in AZ July 10, 2008
 
2.
PPU
Shorthand for AGEIA Technology's physics processing unit.
"I just upgraded my CPU, GPU, and got one of those new PPU's they're talking about!"
by Teqonix August 22, 2005