When a man is on another man lap getting anal. The guy on top gets a reach around, and the one on bottom pulls out at the same time they squirt their load.

The double rainbow.
You think bukake is disturbing, check out the double rainbow!
by Louis the brawler November 16, 2010
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phrase commonly used during peak sexual arousal.
Jenny: "Ooo..yes...ooh...uuh..DOUBLE RAINBOWWW!"
by jfigdig July 7, 2010
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The act of coitus interruptus followed by urination, i.e. pulling out early, cumming on a female's stomach, then immediately
pissing whilst the penis is still erect, such that both fluids form a rainbow-like arc.
After six King Cobras and already breaking seal, I couldn't hold my piss in anymore, so I figured I'd give my girl a double rainbow. She was so happy she cried 'Double rainbow all the way, what does this mean!?!'
by Palin '12, Cuz It'd Be Funny November 5, 2010
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intense joy, coupled with extreme emotional shifts; an experience equal to an orgasm
OMG, it's a full on complete double rainbow all the way across the sky!
by JERKER19 July 17, 2010
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A gay sex position where a man does a back bend, then the second man inserts the first man's penis into his rectum, then proceeds to do a back bend over the first man with the penis still inside of him.
He's so gay he did the double rainbow with your dad last night!
by Doublerainbow April 16, 2015
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The highest level of excitement; it is often expressed with words or phrases like “full on” and “all the way.” Shouts of exclamation may accompany, creating laughter that is indecipherable from sobbing.

TRIPLE rainbow excitement” is extremely rare and could cause you to spontaneously combust.
When I kissed Shannon goodnight for the first time I ran home jumping and yelling. That was some full-on double rainbow excitement, man!
by whiteboyDJ March 12, 2011
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