painbow 

An object in the sky that gives the opposite emotional reaction as rainbows; usually ominous, dark, stormy clouds.

Somewhere under the painbow is a really shitty storm.

painbow by sbamk August 14, 2009

Painbow 

It's like a rainbow but looking at it turns you inside out.

They say seeing a painbow will be the most agonizing moment of your life until you die 8 seconds later.

Painbow by The BooBoo Buddy Club November 11, 2021

Painbow 

a rainbow made of cacti

Pink fluffy unicorns dancing on painbows

Painbow by yuz June 2, 2015

Painbow 

The act of urinating in such a way that it causes sunlight to refract off your pee and create a rainbow.

James: Dude I really gotta take a piss!

Larry: Dude make sure you get some sun in it, make a painbow.

James: Bet

Painbow by Pimento1776 July 5, 2024

double painbows 

Used to describe something as memorable as a double rainbow.
Except it's painful.

I went sledding and face planted in the ice. Double Painbows the rest of the way down.

double painbows by KiriSpork January 3, 2011

Paintbowling 

The spattering of a toilet bowl following a voluminous, wet, squishy fart, often a precursor to a bout of severe diarrhea and the sense that you inner organs are about to disappear out your ass.

I wouldn't use that john if I were you, I've been paintbowling in there.

Paintbowling by Charlie77 January 9, 2013

plainbow

colours together that are very dull to make a dark rainbow.

bob: she's wearing a rainbow of greys and blacks.
bill: yea, she's got a plainbow going on

plainbow by Graceigh Gunn July 7, 2008