1. a sexual act involving people of all genders and sexualities, coming and cumming together in a glorious rainbow orgy

2. a flavour of ice cream (patent pending)
"Care to join me for some rainbow clusterfuck?"

"I'm sorry, do you mean the tasty frozen treat or the sex act? Because I'm down for either."
by naocoolcat May 15, 2014
Get the rainbow clusterfuck mug.