To go rainbow on something comes from the phrase "colorful language."

It basically means swearing at someone.
I almost went rainbow on some idiot today.

I wanted to go rainbow on that asshole.
by Runegutten February 17, 2011
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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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This Police force is the ultimate Police force in the universe. Using their Super Happy powers, they can kill everyone just by using their utter higher state of wapness.

They operate around the clock to fend off people who are breaking the law (according to their standards). This includes beating up korean people, hitting chinese people, or throwing japanese people through windows.
English person: Hey you dumb chinky, how about you stfu? *punches*:

SUPER HAPPY GO GO LOVE SHINE RAINBOW MEGA HAPPY PINK PINK FLUFFY CLOUD POLICE: OK THATS FUCKING IT, PREPARE YOURSELF FOR SOME SUPER HAPPY POWER!! *unleashes rainbow attack*

English person: AHHHHHH!!!!! *dies*

SUPER HAPPY GO GO LOVE SHINE RAINBOW MEGA HAPPY PINK PINK FLUFFY CLOUD POLICE: HAR HAR! THE DAY IS SAVED LZO! ^___^ SUPER HAPPY ME....*gets run over by lorry, dies*
by cloud March 12, 2005
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