Top Definition
Little bugs that crawl up your butt and bite the inside of your ass. Rainbowbugs are not necessarily rainbow colored.
The term originated from Eric Cartman of the T.V. series South Park.
Damnit, these rainbow bugs wont leave me alone!
#rainbow bug #bugs #ass #bite #butt #disease
by Iggy Wilkonson October 04, 2007
5 Words related to rainbow bug
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