Rainbow Dash

A main pony from My Little Pony: Friendship is Magic. This bitch is so fast, she was the first, and the last to ever do a sonic rain-boom. THE MOTHER-FUCKING SONIC RAIN-BOOM. YOU KNOW WHAT THAT SHIT IS? Only a Pegasus with mad SKILLS can pull that shit off.
And you just got 20% cooler in the 10 seconds flat that you read this.

Person 1: Hey, I started watching MLP:FM, and my favorite pony is Fluttershy, what's yours?
Person 2: MUTHA FUCKING RAINBOW DASH!

Rainbow Dash by hobojoeroxursox July 30, 2011

Rainbow Sandwich

When three men have anal sex in a chain so that one is "sandwiched" between the other two

He totally got rainbow sandwiched by those two black guys last night

Rainbow Sandwich by Dr Calzone March 7, 2010

Rainbow Blow Gush 

The act in which a male receives oral sex from a male or female and while doing so, is eating Fruit Gushers.

The other day Matt was out of control! He got 2 Rainbow Blow Gushes in 1 hour!

Rainbow Blow Gush by Walter Danielson May 4, 2011

Rainbow Poop 

A genetic mutation occurring with a cat and a Pop Tart resulting in the ability to have an addicting annoying song, something to troll about, the icanhazcheeseburger franchise, and making rainbows come out of your butt while flying through the air. The rainbow poop can be turned into monochromatic poop if the Nyan Cat's diet isn't maintained. His diet is small children and bananas.

Son: "Mommy, why are we putting little Jeffery outside?"

Mom: "We are feeding Nyan Cat, dear. We don't want his rainbow poop to turn monochromatic."

Rainbow Poop by Captain Jack Mehoff December 17, 2012

Rainbow Hotpocket 

When 2 lesbian or bisexuals buy some skittles, and then pour the skittles into each others vagina and eats them out, resulting in extreme pleasure and amazing taste that lasts days.

Guy1: dude me and my gf were talking about awesome uses for food.
Guy2: Really? Name your favorite.
Guy1: Well I heard about this one girl who poured skittles into her pussy and had some hot chick eat them out. I call it "the rainbow hotpocket"
Guy2: THATS FUCKING AWESOME DUDE!!!

Rainbow Hotpocket by African Tacoman December 28, 2010

rainbow rocketeer 

any man who is very open about humping other men and letting them hump him

"dude, that rainbow rocketeer over there was saying how his life partner tore his sphincter in three last night, i about tossed my effinglunch!"

rainbow rocketeer by Tomzilla April 10, 2005

Rainbow Cake 

When someone shoves fruity pebbles up their partners butt hole, and then jumps on their stomach with full force. This causes them to shit it out.

Mike: Hey! Get those fruity pebbles away from my butthole!
Steve: Don't worry bro, I'm not making a Rainbow Cake.

Rainbow Cake by Gurwie March 26, 2010