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!
by Iggy Wilkonson October 04, 2007
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug