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When an assortment of different colored booties (aka different raced women) simultaneously twerk around one's body in an arch much like the shape of a rainbow. As opposed to the traditional 7 colors of the rainbow, you would generally see white, black, brown, yellow, and occasionally red in this palette of shaking badonkadonk.
"Hey man did you see Justin getting some fine booty at the club last night?"
"Yeah! The dude had a full twerk rainbow around him when they played *insert latest ign'ant rap song*!"
by ol'dirtybastard September 04, 2013