A cumsponge is the
sponge you keep on your bedside table in preparation for performing "the spongebob," the sex act where you shoot your cum on a
sponge before wringing it out over a girl's
head.
"Hey girl, I'
m gonna be late for our date cause I'
m preparing my cumsponge for later."
"Oh, that bowl of water? Yea, I keep it there so my cumsponge is always ready to go."
"Naw, I can't make it today brah..... I gotta
clean out my cumsponge cause I hit my girl with that spongebob last night."