The act of painting your fingers on the hand that you masturbate with, individually with each 1 color of the rainbow (Red, Orange, Yellow Green, Blue, Indigo, Purple). You then proceed to very lightly touch the opening of your penis with each finger, so that it creates a mixture of colors directly on the opening of your penile skin. You then proceed to masturbate as usual, with wet, colorful fingers. Your penis should turn several colors during this process. When you are about to release ejaculatory fluids, rub the tip of your penis once more with the several colors. When your ejaculatory fluids are released from your penis, it should be very colorful and bright.
Guy 1 = Dude, have you ever tried a Rainbow Dash?
Guy 2 = Isn't that from my little pony?
Guy 1 = No the masturbation Rainbow Dash!
Guy 2 = Oh fuck yeah! They are so amazing. I decorated my mother's birthday cake with my multicolored sperm.
by SourPwnage November 29, 2012
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She is basically a 20% cooler version of Lightning Mcqueen and a pale cyan Pegasus used in alot of Lesbian fan art
Guy1: hey man what's your favorite MLP character?
Guy2: its soo Rainbow Dash dude!
Guy3: oh you mean Lightning McQueen?
Guy2: go the fuck away
by Somedudeontheinterwebz September 18, 2019
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to make something 20% cooler.

Can also be used to explain how awesome or fast one is being.
"Hey Heather, you make this table 20% cooler."
"Oh thanks! I like a good rainbow dashing from time to time."

"Did you see that?! I'm so rainbow dashing!"
by 20%Cooler November 13, 2011
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When two gay guys are finger blasting each others asshole while eating fruit stripe gum. Driving in a Miata singing Katy Perry songs.
What’s Hayden and Mc’boy doing tonight? I don’t know probably rainbow dashing in nampa.
by Cptwoodslinger October 18, 2020
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Rainbow dash is a female pegusi from my little pony friendship is magic she is the element of loyalty her dream is to be in the wonderbolts she hates losing the only thing she is afraid of is being a failure
Rainbow dash:not the girly one

Rainbow dash: THE TOMBOY ONE IS BETTER
by Rainbow_dash12345678910 August 26, 2017
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the rainbow dash cum jar is a reddit post that depicts a rainbow dash figurine submerged in a mason jar full of cum. the owner of the jar would frequently update the posts and show the cum that has been added. the jar was later accidentally boiled over a space heater, turning the liquid brown.
“have you heard of the rainbow dash cum jar?”
by epic bruh moment February 29, 2020
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