Dirty Rainbow 

The act of sticking you whole hand up someones asshole, then pulling it out and smearing it on them, openhanded, in a semi-circle pattern to resemble a rainbow. Similar to a dirty sanchez, but this is much bigger and can be done on other parts of the body.

Hey man, I just gave your sister a dirty rainbow.... Then I shot her my pot of gold.

Dirty Rainbow by T-Roc86 December 18, 2009

Mrs. Rainbow 

Lindsay Lohan and/or being very colorful, radiating a similar positive vibe, generating smiles.

Originally she was refered to as Lindsay "Rainbow" Lohan because her fans imagined that's what she would smell like (like a rainbow). But since 'rainbow' can also be used to describe her appearance - in it being very colorful and radiating a similar positive vibe, generating smiles and so on, she quite simply became Mrs. Rainbow - a person able to bring colors into our lives and positive vibes into our hearts.

Mrs. Rainbow by Rooster Fitdse November 6, 2008

Triple Rainbow 

Such intense amounts of joyous orgasmical ecstasy that it makes Double Rainbow feel like torture
Refer to Double Rainbow

Johnson: Dude I just saw Inception yesterday.
Randolf: Oh yeah? How was it?
Johnson: Dude.... TRIPLE RAINBOW!!!!11!!1

Triple Rainbow by BOYETCHLES July 20, 2010

emo rainbow 

a certain clothing style and tween attitude for scene people usually 9-14 years old and have an emo style in bright colored clothes from places like stitches

style has gone down considerably in the past 3 years

pixie haircut or short and long around the ears perfectly flat ironed and teased up for extra volume she's totally an emo rainbow

emo rainbow by atomicjigsaww March 26, 2011

Over the rainbow 

Where the male and female ejaculates into a cup followed by melted skittles combined in a shot glass....traditionally spit and drank by both parties ...untraditional is when you get him or her to unknowinly drink it

-Yo tell me what was that drink just now? -
-Oh thats just an over the rainbow ....-

Over the rainbow by Tammy Bee November 12, 2018

Double Rainbow

When playing poker (i.e. Texas Hold'em) and some one bets 2 of every color chip

I'll call your measly bet and raise you a double rainbow!

Double Rainbow by Tom.Gar.On. July 24, 2010

Tasting the Rainbow 

When a one person sleeps with an asian, black, white, and hispanic in one night

that guy walked in the room with four girls with different races he must be Tasting the Rainbow

Tasting the Rainbow by aslan49 September 9, 2010