Where one person (usually female) is not permitted to have an orgasm alone (e.g. through masturbation) unless permission given by their significant other, Master, etc. Often used in D/s relationships. Very hot!
Girl1: Why are you acting odd?
Girl2: I'm so frustrated and can't concentrate. My bf has cum banned me and I won't see him for another month
Verb- The after effects of orgasming many times after sex and or masturbation including foggy memory, sleepiness, giddiness, zoned out.
aka Cumming your brains out. Can also be spelled "coom brained"
You were so cumbrained last night you passed right out afterwards it was cute.
I tried playing video games with you afterwards but I was too cumbrained to focus.