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This is when a guy is taking a shit in a port-a-potty while receiving oral sex. Once he finishes he dunks the girls face in the blue water. Her face is blue from the water and should look very grumpy if done properly.

Similar to the blumpkin but with a sly unpredictable ending
Person 1: My girl cheated on me and i want to end it and get her back at the same time, any ideas?

Person 2: Nothing says its over better then the grumpy smurf my friend
by Chris Waltham November 01, 2011
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