Chocolate Rainbow 

A gay black guy.

Yo, that nigga Tirrell he tried to put his dick in my mouth; I didn't know he was a chocolate rainbow?
Yum, I want that chocolate rainbow.
50 cent is the biggest chocolate rainbow of them all!

Chocolate Rainbow by suga night June 2, 2010

Nigger rainbow 

Rainbow made from Niggercentipad

My heart leaps up when I behold
A nigger rainbow in the sky...

Nigger rainbow by spridax October 30, 2012

shitting the rainbow 

After eating food with copious amounts of food coloring, your poo takes on colors other than the usual shades of brown.

Mate, have a look at the icing on this cake. . . I'll be shitting the rainbow after this.

shitting the rainbow by Tim J Kelly August 12, 2005

Boarding Up The Closet With Rainbow Corpses 

Someone "boarding up the closet with rainbow corpses" is blatantly homosexual man or woman who tries to hide their gayness through extreme and sometimes violent homophobia rather than coming out of the closet and accepting their sexuality. Derived from the phrase "coming out of the closet" which refers to admitting to the world that you're gay, and to the fact that the rainbow is usually a symbol associated with gayness.

me:"I can't believe Chris! How can he call me a faggot and then threaten to rape me? Isn't that like, the most homosexual threat you can make?"
Seamus:"Dude, chill, he's just boarding up the closet with rainbow corpses. He's more of a fag then you'll ever be."

(editors note:this is based on a real conversation that occured a few times)

Boarding Up The Closet With Rainbow Corpses by Vhurka March 22, 2010

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