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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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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 01, 2016
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