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1.
When you are "doing", "bumming", "ploughing", "banging", etc. someone up the arse, she/he (if your a poofter) farts and blows your dick off.
John: "Tom, why are you clutching your crotch?"

Tom: "Arse Blast I'm afraid" Clutching the hole in his groin

John: Ouch!

by Mr Coolio October 24, 2007