The word hails from Elko, Nevada, wherein there is a football field called Kump Field. One day, a group of girls were watching a Pee-Wee football game on said field, when they noticed how awesomely stupid the word Kump is. So from then on, Kump became a word you use to insult people. It's pretty much another word for idiot, retard, stupid, dumbass, douchebag, etc.
God, Mike was being such a Kump today!
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