colourless rainbow 

utter disappointment, letdown, something insipid.

The football match was a colourless rainbow.

colourless rainbow by uttam maharjan July 1, 2010

rectal rainbow

When all the diarrhea has poured out of your anus (or whatever orifice it escapes), the butthole makes a promise to never flood your pants again.

I hope a rectal rainbow rescues me from the aftermath of that gas station burrito.

rectal rainbow by ballsonyabeaver March 4, 2015

mexican rainbow kiss

Like a normal rainbow kiss but with shit and piss added to the period blood and cum.

That slut just got the Mexican rainbow kiss from the drug lord.

mexican rainbow kiss by El chap October 4, 2016

In The Rainbow 

When you and your girl have a threesome with another girl. Then your girl has way more fun than you are with the other girl. Then dumps you for that girl

When Billy laughs at Tom when he got dumped by Becky with his side hoe.
"Ha Ha you've been left In The Rainbow" he laughs out.

In The Rainbow by Tent_The_Bean June 7, 2017

Taste the rainbow

Tasting the rainbow

When you eat a full bag of skittles and then let your gf or wife give you a blow job

Then whilst cumming in her mouth you whisper taste the rainbow in her ear

I made Lisa taste the rainbow last night and she loved it

Taste the rainbow by Therandomone February 4, 2018

Chilli Rainbow 

Is when a woman is hunched upside down on her shoulders, where she then pisses and shits on to her own face representing the pot of gold. The piss would pan out acting as a rainbow. The logs of soggy poop would soar through the air as if it were chilli.

When President Bush Eats Mexicans He Chilli Rainbows himself asleep. The End.

Chilli Rainbow by Jonathan Ramjattan May 24, 2008

rainbow cadillac 

giving blowjobs to guys in a car.ie like a rainblow party in a car

in the song show stoppers-"all my girls in the rainbow cadillac"

rainbow cadillac by Ann Julie December 19, 2006