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Rainbow slapping is act of smacking your girlfriend/boyfriend in the forehead with your penis while they are asleep or not paying attention.
Brent love rainbow slapping his girlfriend when she sleeping
by Dough_boy270 June 01, 2009
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When an uncircumcised man puts Skittles into his foreskin and slaps someone while yelling "smell the rainbow!"
My boyfriend Rainbow Slapped me the other day and it doubled as a really good snack.
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by Nacho_7258 June 06, 2017
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