your nailin a girl while she is on her period (with a condom of course) and you shoot into the condom, then you make her drink the contents out of the condom like it is an oddly shaped glass. 'rainbow' comes from the idea of many different colors all draining into her mouth.
my girlfriend was on her period, and she really wanted to fuck, but i wasnt really feelin the whole blood-thing, so i told her i would only if she would 'taste the rainbow.' that bitch slurped it up like the final parts of a milkshake haha.
by vic tha sick dick June 28, 2006
Get the taste the rainbowmug. by nomi12791 April 20, 2008
Get the Taste the Rainbowmug. by 'Bow Taster October 29, 2010
Get the Tasting the rainbowmug. by scientific researcher January 16, 2013
Get the Taste the Rainbowmug. by TtlyNotaJew April 29, 2011
Get the Taste the Rainbowmug. Achmed, LeShaun, Jose, Ching-Ming, Eric, and Chief Running-Horse all came into Vanessa's mouth. She really enjoyed tasting the rainbow.
by A Mexican Midget November 9, 2011
Get the Tasting the Rainbowmug. by J. Grizz May 27, 2011
Get the tasting the rainbowmug.