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.
by Tim J Kelly July 21, 2005
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To make up or extremely bullshit something so out of this world, that there is only one place one could have received it from and thats a rainbow
Tom: I ran 1 million yards in 2.4 seconds
Me: NO way, how did you do it?
Tom: Haha, its impossible, i'm just pulling shit from rainbows
by Mattybas December 23, 2007
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Person 1: HEY SERGEANT CID, GO SHIT A RAINBOW EGG.
Sergeant Cid: srtop it.
by Wylin May 13, 2009
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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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The shit rainbow:
Purple: putrid gameplay
Blue: bad music quality
Green; Graphical farts and garlic
yellow; Piss poor keeping the source
Orange: Orange you a fucking idiot
Red: horrible rage educing masochism
-The Angry Video Game Nerd
LJN is classified as a shit rainbow
by Slenderman666555444 January 2, 2012
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When a person is in a state of such ecstasy that if they were to defecate, the substance would contain nothing more than a magical beautiful rainbow.

"Hey. I heard Jake got laid last night"
"Yeah...you should have seen him this morning...looked like he was shitting rainbows."

"OMG!! When Daniel asked me out...I swear I was shitting rainbows..."
by NeshaMP January 13, 2009
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