Top Definition
When, due to a lack of extra females, one female purchases a set of different color lipstick and proceeds to give a male driver a blowjob, applying a new color every few minutes until the driver's penis looks like a gay pride flag.
"Hey honey, why don't you pick up four extra colors of lipstick while you're in CVS, and then you can give me a road rainbow on the way to church."
by pariotto August 16, 2009
5 Words related to road rainbow

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