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2.
1: Tripping on the potent psychedelic drug 2C-P, also known as 'Rainbows.' due to it's production of multicolored soft pastels visuals that breach the color spectrum. 2C-P is a phenethylamine psychedelic of the '2C' class.

2: Overcome by the intense psychedelic high of 2C-P.
I did 20 milligrams of Rainbows last night. I freaked.

I am rainbowed.
by starfire_X February 10, 2012
 
1.
(rān′bō′ éd)

When a doof's atmosphere elevates to such an extreme level that it causes the releases of natural endorphins in the brain. These endorphins, combined with the enriched nature of your soul and a mixture of substances as copious as they are numerous, combine into an potent cocktail causing a blissfully euphoric emotional state in which one's identity and conscience merge into the festivals collective-being. Often expressed by dancing.
I was at Rainbow Serpent Festival with the rework crew last year, everyone was so rainbowed.
by howsyarainbow?havingagoodtime? February 04, 2014