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The art of taking a poop into another persons anus. Then this person will poop it back into you, thus coming back to you like a boomerang.
Guy 1 " dude, I heard you did an Australian Boomerang last night?"

Guy 2:" Totally, except Greg had diarrhea"

Guy1 : " EWWWW"
by Ron Bush April 03, 2008
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