Top Definition
Gay Anal Sex; Homosexual Buttfuck; When two men do each other!
Robert: Hey Baby, I want to give you a Rainbow Muffler!
Enzo: NO WAY FAG!
Peter: LOL
Roosevelt: I'll take it baby
von RMenke 6. April 2011
1 more definition
Having several sexually transmitted diseases at the same time.
Lana has a blue waffle, a purple sock, the clap, the drip, and crabs at the same time. So Lana has a Rainbow Muffler.
von RainbowMufflerz 6. April 2011

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