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1. bumcum
BumCum is after your partner has ejaculated in your ass, and then Cum starts dripping outa his ass hole.
eewww, omg my bf fucked my ass last night and then started drinkin my bumcum.
by Rush Apr 12, 2005 add a video
2. bumcum
A translucent, beige, sticky, mucus created in the rectum by the body to help prevent log jams.
...so i ended up at her house and she opened a drawer full of toys but I had to pick the dried bumcum off her butt plug before we could use it...

I thought there was a monster turd brewing but I sat there for 15 minutes and only managed to fart out a teaspoon of bumcum.
3. bumcum
bumcum is actually the slick substance that you feel in your bum after you have done a lot of working on on a hot summer day.
I had mad bumcum the other day when I was running in gym.
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