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An idiot or person who regularly makes mistakes, usually by not listening and then having the f-up everyone told them they could avoid
Girl 1: I told you to go get that checked
Girl 2: Yeah well.. I didn't
Girl 1: You bloody sponga

Bloke: I'm gonna do a backflip off of this wall!
Girl: Dont you spong, last time you did it you broke your ankle
by Bananabird October 06, 2016
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