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Australian boomarang 

When you're jacking off and it shoots out hits an object and hits you in the face.
Dude I was rubbing one out last night and I totally got Australian boomaranged!!

Australian Boomerang 

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"