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

Go shit a rainbow egg 

Something Sergeant Cid should do.

Person 1: HEY SERGEANT CID, GO SHIT A RAINBOW EGG.
Sergeant Cid: srtop it.

Go shit a rainbow egg by Wylin May 12, 2009

step on a rainbow 

to transform from the temporal plane & move to the astral plane, the act of dying.

i feel really bad for Roger, his mom's sick & pretty soon she's going to step on a rainbow.

step on a rainbow by yojinbou February 10, 2008

pop a rainbow 

The act of layering several polos, each of a different color, and subsequently popping each collar.

Though the laws of fashion clearly forbid the practice, Lance can be seen to pop a rainbow daily.

pop a rainbow by landpolicy July 26, 2006

Hug A Rainbow 

To embrace people of all shades, colors, nationalities, etc.

To love the human race

Bob: Sally is so cool she doesn't discriminate at all, she loves everybody.

Sandra: That is true she's always hugging rainbows.

Stop being a prejudice and go hug a rainbow!

Hug A Rainbow by shikiboo1 July 31, 2010

gayer than a rainbow

Basically, you're gay as fuck. Nothing is gayer than rainbows.

Have fun being a fucking homo for life dude. (i support u <3)

" You're gayer than a rainbow dude!"
" i know."

gayer than a rainbow by CinnamonRol~ February 21, 2017

pee a rainbow 

peeing for long enough to count out loud to 100

I drank six bottles of water so that I could pee a rainbow!

pee a rainbow by Rusty Scupper August 2, 2006