A brand of leather flip flops, usually in brown. They are made with a special material so that the wearer's foot molds to it, but unfortunately creates an unattractive footprint (with all the toes).

Rainbows usually cost about $40-50 because of the quality and the brand name. I like to think of them as the Uggs of flip flops.
Reasonably rich person: In the summer, I wear my Rainbows. In the winter, I wear my Uggs.

Other person: Hmm, you have a footprint on your flip flops.

Reasonably rich person: They're not JUST flip flops, they're Rainbows!
by ncl11 September 20, 2009
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A game where a group of girls use different coloured lipstick to make rings along the length of a boy's penis with their lips. Usually done by girls too young to give head.
After they gave the boy a rainbow, his penis looked like a candy cane!
by Erin1227 November 6, 2005
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Me: When I was like 10, I named my betta Rainbow.
My Friend: awesome name!
Me: Ikr
by BlueJ November 18, 2020
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brown, monotone sandals that instantly classify someone as a "prep", regardless of who they are, what they wear, etc.
1: OMGSH Sally did you see Megan's new rainbows? She can't be in our Goth group anymore
2: I know right?! She's such a preppy poseur.
by Yasmina December 3, 2007
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Hard rock band formed in the mid-1970s by guitar virtuoso Ritchie Blackmore after leaving Deep Purple. Initially fronted by singer Ronnie James Dio who eventually left in 1979 to replace Ozzy Osbourne in Black Sabbath. Rainbow incorporated medieval themes and classical-inspired guitar work into heavy metal.
Rainbow's big songs include "Man on the Silver Mountain", "Long Live Rock N' Roll", "Stargazer", "Since You've Been Gone", and "Stone Cold".
by Bill M. September 10, 2004
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to arch something so you are able to catch it
"Hey Mike, rainbow it that so I can get it in my mouth!"
by APbio November 13, 2007
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