ass rainbow
An imaginary meteorological event occurring after a severe bout of diarrhea, much as a rainbow occurs after a thunderstorm.
"Oh my god, the Kaopectate finally kicked in... I think I've having an ass rainbow."
Rainbow Ass
Any person that when they bend over has hair coming out of their butt. Referred to as a "rainbow ass" because it is popping out as rainbows do from clouds.
"Look at that guys rainbow ass,no one wants one of those."
rainbow ass muncher
A gay man who gives rimjobs.
Momo:: "Rasheed is such a Rainbow Ass Muncher!"
Duji-chan:: "Yea, what an Ass Ninja"
Duji-chan:: "Yea, what an Ass Ninja"