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Related to "lasers" and "shoop da whoops", a "Royal Rainbow" is what happens when a taco is forced into the mouth of the person charging their laser. The caster instead releases a Royal rainbow, and possibly the swallowing of one's laser, and can end in the shooper asploding.
*Jered fails HARD*

Phil: I'MA FIRIN' MAH LAZOR!

*Jered shoves taco in Phil's mouth*

*Phil releases Royal Rainbow*

Phil: OPS I SWALLOWED MAH LAZOR!
by Corey_Faure April 30, 2010
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2
To throw up profusely, normally in the figurative sense. Usually in response to something that is too cute or just outrageous for words. Done in the fashion of the King of Cosmos from Katamari Damacy in which the person emits a large rainbow from the mouth that has pink instead of indigo for some reason.
My girlfriend is so cute, she makes me want to Royal Rainbow whenever I see her. It must be love.
by Baby S. Doll July 26, 2007
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3
Shot of Crown Royal folled by a handfull of Skittles as a chaser.
The Royal Rainbow is when a shot of Crown Royal makes you cringe and the skittles make you come back for more!
by RR Royal Rainbow May 31, 2011
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