Top Definition
To have had romantic or sexual engagements with every race in your lifetime. One only reaches the status of having *done* the Rainbow after you have completed this accomplishment, which unless you are a sleazy whore in a heavily multi-cultural area, may take some time.
Josh: Me, I have only been with one girl who was not white.

Liz: Me, I have "done the Rainbow".

Josh: What is "doing the Rainbow"?

Liz: It is having been with at least one member of every race I can think of.
by 81mclaren@gmail.com November 17, 2007

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