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1.
The feeling you get when something is so crappy that it's crappiness becomes almost a good thing in an explosion of crappiness. In other words, orgasmically crappy.
This organic chemistry book is making me crapgasm over and over!
by tekdemon December 31, 2004
 
2.
The result of a blumpkin.
Oh my gosh, when Jeannie gave me that blumpkin, I managed to crap and orgasm at the same time. I have to tell you, there's nothing quite like a crapgasm.
by Gwartron August 08, 2010