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Rainbow Day 

Sometimes used to refer to the first day of a girl's period.
"Sorry if I'm acting bitchy, it's Rainbow Day."
Rainbow Day by Palomitas27 December 5, 2015

rainbow patch 

When you eat a girl out when she's on her period and your mouth holds a red stain
Last night after I ate Ashley out I checked in the mirror and I had a rainbow patch! Now I can't get this nasty bitch blood out my mouth

rainbow tacos 

That hot chick hates guys - she is only interested in rainbow tacos.
rainbow tacos by Scorpio.71 April 5, 2016

Rainbow smartie 

When you're having a good day and you get good vibes from everyone,even though you should be in a bad mood because people treat you like crap.
Although sallie pied off Aaron,he being a rainbow smartie today,God I envy him.
Rainbow smartie by Mandelaaa October 5, 2016

Rainbow Stream 

The act of a male and a female having intercourse until the male is almost at climax, where the male then pours multiple bottles of different coloured food colouring dye into his urethra before continuing. At the point of climax, the male fills the female with his semem mixed with the food colouring dye, which gives off the appearance of a rainbow.
"Elyalesiana was feeling pretty down, so I gave her a rainbow stream. She seemed to be fine after that."

"Dude, I fucked up."
"How, dude?"
"I gave my chick a rainbow stream on an unsafe day. Now I might end up with a rainbow-coloured baby."
Rainbow Stream by SmokyMcBong September 25, 2016

rainbow shit

Girls who wear ridiculous amounts of colours on their clothing. Play safe. Play black.
"Brittany didn't get the memo about always wearing black, it's 2016... She looks like a rainbow took a shit on her

"Yea totally a rainbow shit."
rainbow shit by UndercoverOrca August 9, 2016