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The action of pooping out of one's asshole into another's asshole and then the receiver of the poop pooping back into the server's (the original defecater)asshole, and repeating until one asshole fails to catch the poop: the loser. This game goes on similar to ping pong until one person emerges as the victor.
"dude, Julie totally just whooped my ass at filthy pong"

"Wouldn't it be cool if Filthy Pong was a video game?"
by Alex Bearden September 02, 2007
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