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means having sex with someone and immediately breaking up with them afterwards. Aforethought is not required - you can dump them simply becasue the sex was bad.
1) My girlfriend came over and bangdumped me for absolutely no reaon.

2) I decided to bangdump a guy I was dating because my mom didn't like him (and I didn't know when I would be banged next).
by G-Myster February 04, 2014
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