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A state of mind; usually occuring after taking some form of hallucinogenic drug. The effect can be intensified by stellar music and massive amounts of glow sticks flying through the air. Sometimes kaleidoscopes of rainbows will occur.
I got brainbowtarded at that Phish show last night.

Q: How are you doing?

A: Dude, I'm brainbowtarded.
by funk E. bee February 04, 2010