When you have been in such a happy mood for longer than three weeks, that it affects your shit - turning it into a wonderful display of happiness as it is pooped out. Can be put on display. The multicoloured shit is often in the order of the rainbow if the happiness is genuine and if the colours are out of order, there is an underlying issue of mania which can be diagnosed by slicing the shit horizontally.
Dudette 1: I love what you have done with your bathroom
Dudette 2: you do? Thanks. I have been on such a high this last month I knew I was due some rainbow shit
Dudette 1: but how did you get that pattern?
Dudette 2: I just ate a fucking hot curry one night and in the morning: tada!.....rainbow walls!
by ChiefPoof May 27, 2016
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When a girl doesn't get the "all black" fashion code and comes to the club looking like a rainbow shit on her.... Circa 1995
"Lara looks like a rainbow shit on her" Tiff
"I know... That is so 90s" Karen
by UndercoverOrca May 27, 2016
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when you are happy and having a wet dream sometimes you poop a little. this is know as rainbow shit when you are so happy you poop without knowing. this can get kinda messy so make sure to wear a condum! thanks!
rainbow shit is allllll over to my bed.
thats hot.
by lola cameron April 14, 2020
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A Rainbow-Shitting Unicorn, is the gay equivalent of a Panther.
A Rainbow-Shitting Unicorn is when a younger male, chases older men.
Guy 1: "You know I'm 25 right...?"

Guy 2: "Just because I'm 15 doesn't mean anything, I'm a Rainbow-Shitting Unicorn."
by KickAssKyle January 7, 2011
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Used to sum up an event, action or feeling as a whole.

That's full of bullshit and gayness.

(Not of the homosexual kind either)
Dude 1: I got a ticket today. Girlfriend broke up with me, I got fired from my job, and my Xbox 360 got RROD!

Dude 2: Wow bro your day sucked.

Dude 1: I know right? fucking Rainbows and shit.
by KnightimeX December 1, 2011
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Someone who has such extraordinary luck that if they were to defecate a beautiful rainbow would come out of their anus rather than faeces.
"Went into town with Jim last night, he ended up shagging a 10/10er and won £100 on a scratchcard"! "Lucky bastard is shitting rainbows".
by Bilbobaggins March 26, 2013
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The third and highest stage of tripping out (usually on shrooms). The three stages include tripping, tripping balls, and shitting rainbows.
druggy one: "yesterday I ate some crazy African mushrooms and ended up shitting rainbows."

druggy two: "You have any more of those?"
by alexmanjina March 4, 2010
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