Rainbow slap 

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

Rainbow slap by Dough_boy270 June 2, 2009

Rainbow Slap 

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.

Rainbow Slap by Nacho_7258 June 6, 2017

slapped by the rainbow

it is when you jizz in your hand and grab a hand full of skittles n slap someone in the face with it

my girl friend was "slapped by the rainbow" last night whiloe we were having sex

slapped by the rainbow by skittle man1234567890 October 7, 2011