Top Definition
Receiving intense pleasure from being pessimistic;
An orgasm of grumpiness
Doc had a grumpgasm when the other six Dwarves noticed he wasn't whistling while he worked!
by Jody M. November 01, 2006
A grump so good, you feel like you just blew your load.
After eating a Ribeye, two baked potatoes and a salad last light, my grump this morning was so awesome, I had a grumpgasm.
by brandonlh August 19, 2011
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