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Isabummer is the name given to Isabella Swan from the Twilight series referring to the way she whines and mopes. It is a play on words.
Friend 1: I didn't want presents for my birthday! I didn't want a party!
Friend 2: Keep whining about how much you hate people giving you presents and you'll turn into Isabummer!
by BTell January 30, 2011
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The vengeful act of crapping on a lover's chest while they sleep.

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