A rainbow in the underwear 

A rainbow in the underwear occurs when someone (presumably a man) has made the greatest possible variety of excretions in his underpants. This would consist of a brown stain, a yellow stain, and an off-white stain.

Jean Pierre Garnier never wipes his ass, so he has skid marks; he has also been known to have wetdreams almost nightly. A few months ago thirty people came to his house to scream at him. He pissed himself and a made a rainbow in his underwear.

A rainbow in the underwear by DLa April 6, 2005

Taste the Rainbow

When a straight person has a homosexual experience.

Jenny: I saw Mary is so hot
Jane: Yeah, I would taste the rainbow with her

Taste the Rainbow by nomi12791 April 20, 2008

spunk rainbow 

Four guys sitting in a row wank the guy to the right off and the one on the end spunks over the two middle guys and lands his man seed in the guy on the other ends face as it goes over it causes a rainbow effect.

Wow look at that spunk rainbow! Ahhhh my face.

dude if you get me a beer ill treat you to a spunk rainbow.

spunk rainbow by ralshtovski February 6, 2010

Reversed Rainbow 

When a male inserts his own penis into his asshole and bouncing up and down, creating a reversed rainbow

I was very lonely so I gave myself a Reversed Rainbow.

Reversed Rainbow by Taj Mahal April 20, 2007

Albino Rainbow 

Also known as a cloud

Look at that albino rainbow!

Albino Rainbow by (Garth Vader) December 10, 2014

Catch the Rainbow 

To catch the rainbow means to achieve the impossible, figuratively.

Finally, I have caught the rainbow! *Insert thing you have achieved*.
I will catch the rainbow with this project I'm making!

Catch the Rainbow by Ender_406 March 11, 2021

Quadruple Rainbow 

Quadruple Rainbow all the way!

Those fries are Quadruple Rainbow all the way!

Quadruple Rainbow by supercalafragalisticexpialados December 12, 2010