When a man ejaculates his semen from a distance into another individual's mouth. The individual receiving the semen is sometimes referred to as "the pot of gold" at the end of the Cum rainbow.
Justin positioned himself 2 meters away from Ryan, and with great precision, managed to ejaculate into Ryan's mouth. Justin had achieved a Cum Rainbow.
by Dezmuz June 1, 2016
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To splooge in an explicit, uncontrolable colourful way
"The boner i have is so vicious, i could cum rainbows"

"That chick was so hot, i swear i almost came rainbows"
by ToastyXP October 20, 2008
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The name of the cum that you produce when you orgasm specifically when you are high
"Bro my Rainbow Cum last night dude was off the scales!!!"

"Bro same dude!!!"
by chocolatethunder19 August 14, 2017
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the cum know to be made by unicorns.Often is mixed with fairy piss to make hallucinogenic.
Dude Rainbow cum fucked me up last night so bad that I shit on my dog.
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A common phrase on sites such as Derpibooru, e621, Rainbooru and Rule 34 that means wanting to impregnate the character Rainbow Dash from the series My Little Pony Friendship Is Magic.
David: dude, I want to cum inside Rainbow Dash
Chad: fucking loser lmao
by SonicTheDankHog December 28, 2022
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