Top Definition
Is fun to be around and knows how to make a person happy. The nicest person you will ever meet. Is as pure and innocent as can get.
by Ronald Q February 06, 2009
Stands for 'Play in an oven', used to insult noobs on WoW.
Can be used like DIAF.

"All your base are belong to us!!!"
"Assholes, go P.I.A.O"
by Holly. F May 24, 2008
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