To eat skittles or other flavorful candies out of a females reproductive organ.
"Dude did you give sam the rainbow last night?"
by Amanlacyaubjosh June 25, 2008
the act of blowing your load over a midgets head. not on their head, over their head.
When Tom finishes having sex with his midget wife, Shelly, he always does the rainbow to her.
by rapingyourmind April 27, 2010
When a guy gets the girls period blood in his mouth, she gets his jizz in her mouth, and then they swap them.
Dick and Jane love doing the rainbow at their dungeon sex parties.
by DirtyStoner420 July 12, 2013