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The sometimes cute, sometimes ridiculous and always hilarious expressions made by young starlets taking a face load of man batter during the money shot at the end of a grumble flick.

Derives from the term used to describe the facial contortions of toothless old men in certain old English pub competitions.
Bob: did you see that young sperm dumpster that was cum gurning at the end of Jungle Fuck Bunnies IX ?

Albert: Yes, she looked very surprised to catch a half a tub of yoghurt on her forehead.
by Stinkfingers October 11, 2010
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