Double rainbow - when two guys cum over another guys face at the same time, hence crossing spunk streams - meaning to be double rainbowed.
"I really want a double rainbow tonight"

"Fancy a double rainbow?"
I really want to double rainbow him, are you up for it?"
You should have seen the double rainbow I got last night.
That was the best double rainbow I've ever had.
by cockmaster346 February 04, 2010
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When a male jacks off two other males, especially if they have big dicks.
Last night, I saw a double rainbow!
Dude, you weren't part of it?
Nah, I sat back and just enjoyed it.
by Eyx September 30, 2016
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Nathan Fillion recommends that the new "in" phrase be: Double Rainbow.

It means that which is:

•ecstatically wondrous

•joyfully amazing

orgasmically blissful
Here are some paraphrased usage examples for Double Rainbow from Nathan Fillion and his Twitter page, among others:

"That pizza was so Double Rainbow. Oh my god."

"Possible responses to "Double Rainbow": -Double Rainbow, all the way. -Starting to look like a TRIPLE Rainbow. -What does it mean?" Answer: "A Full-on Double Rainbow!"

That video is so vivid, it's Double Rainbow all the way!

Having a second season of Firefly? Definitely Double Rainbow!.

The brilliance of Nathan Fillion is so intense, it's Double Rainbow all the way!
by Kcat10 July 16, 2010
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When playing poker (i.e. Texas Hold'em) and some one bets 2 of every color chip
I'll call your measly bet and raise you a double rainbow!
by Tom.Gar.On. July 23, 2010
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A "double rainbow" is a phenomenon of optics that displays a spectrum of light due to the sun shining on droplets of moisture in the atmosphere.
Wow! Look at that double rainbow in the sky!
by LoliYandere League of Legends December 31, 2016
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Philip: Dayum, did you hear about Shanene’s and Chantel’s double rainbow session they had last night

Bill: Nah bro I bet it was hot
via giphy
by Therealestrealone#backwoods September 28, 2018
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