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1.
a bloody vaginal fart.
after i fucked her doggystyle, she poowah'ed all over me.
by here coco! April 11, 2008
 
2.
1: an exclamation of win
2: The sound effect a glasses case makes when it opens
"Poowah! Headshot!"
"The gloshnic case opened with a flourishing 'poowah!'"
by NaruandKane April 26, 2009