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Adj. Pertaining to one who is a slut, a cunt, a douche bag, or a variety of the three. Sluntbag is usually used towards females who cheat on their boyfriends, but can be used on males who give the same courtesy to their girlfriends by fucking their best friends.
Devin tried to sleep with Linda when he's already dating Becky. What a sluntbag move.

Perhaps if Sarah wasn't such a sluntbag, she would have been better off with her ex Josh.
by TestamentGoD January 05, 2008
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