A human who's life is devoted to cumming or obtaining cum. Cum has consumed this person and they have given up everything for cum.
Guy 1: Bro I used to like Sarah but she's just a cum bum now.
Guy 2: Dude I know she drained me last week!
Mom: Gary I caught Billy passed out in the bathroom covered in cum!
Dad: Yeah he's a cum bum now.
Guy 2: Dude I know she drained me last week!
Mom: Gary I caught Billy passed out in the bathroom covered in cum!
Dad: Yeah he's a cum bum now.
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