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If something is rainbow, it is something really good and sweet and fun, and a bit silly.

Rainbows are possibly ninjas in disguise.
It is also said that they may be covered in giant invisible cloaks.
dancing in the rain is rainbow.
It is rainbow to sing aloud even if it sounds horrible.
It is rainbow to being awake at 3 PM and writing about rainbows.
rainbow by Cecilie_is_silly July 20, 2008
When you are hallucinating and see a huge line in the sky full of colors. Most likely because you drank way too much of that "water".
Brian- "Look! It's a rainbow!"

Amelia- "Go back to bed honey."
Look! It's a rainbow!..... EWWW!!!
rainbow by anyan October 18, 2011
(florida)
slang word used to indicate a police officer in the area of where the officer can overhear you. rainbow is being used because when cops turn their lights off its a bunch of colors. and its better off the officer dosnt hear you talking about him like oh my god its the fucking police!
Hey dude look a rainbow!
rainbow by gummywormz April 3, 2009
Gays ๐ŸŒˆ
Heyyy, you see those two over there?? *Points at a gay couple*
They live in a rainbow world๐ŸŒˆ
Rainbow by Magical 303 May 30, 2017
The definition of rainbow can also be like your going to play rainbow six siege like '' hey let's play rainbow six siege
Rainbow by r6s fan June 26, 2017