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1.
RPU
Stands for Recreational Powerade User and refers to those who drink the sports drink (powerade) on a casual basis, when it is only to be consumed when one is participating in strenuous physical activity.

RPU's are generally addicted to powerade, as it is full of sugar and contains many artificial colours and flavours, making it taste good. The sooner RPU's start waking up to the fact that these drinks are NOT to be used on a casual basis, the better off society will be health wise.
Matt: See that guy over there, why's he drinking powerade? He's not exercising.

Harold: Ah, bloody idiot. He sure is an RPU
by Hallard05 May 13, 2011
 
2.
RPU
RPU is a computer parts and repair company based in Miami FL. They sell laptop ac adapter chargers for all types of laptops. They also sell and replace broken laptop screens. You can call them at 786-371-8682 or go to their website at www.gorpu.com
RPU Fixed my computer the same day and beat best buys price by half!
by Sahelio April 19, 2011
 
3.
RPU
Retarded pride union

The awesomest group of insane people ever!
Consists of crazy, weird and phyco people.
-person runs past flailing and screaming-
Todd: OH MY GOD WHAT WAS THAT?!?!
Helga: Aw, don't mind them. They're probablly in the RPU.
by RPU VP March 05, 2008