Define Deuche Bag Meaning

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.

Its a thing girls use to wash their pussy.

an ex-boyfriend that was nice to you and after breaking up is completely rude. He continually wants something fromm you but not a relationship.

The principal that in a group of three or more people, there will always be at least one deuche bag.