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1 definition by doomweasel

 
1.
This originally meant, literally, a bag to carry a device that women cleansed their vaginas with. It's now used as an insult, mostly against males, similar to calling them a jerk, bastard, etc. What the insult specifically implies seems to depend on regional vernacular.
"John, you're such a deuche bag for cheating on me."
by doomweasel October 19, 2005