Top Definition
Basically a more modern equivalent of the word 'psychedelic'. Describes anything that has a hallucinogenic or surreal quality. The word 'Acidious' itself refers to acid, the slang/street name of LSD.
Dude 1: Whoa, check out the patterns on that girls top...
Dude 2: How acidious...
Dude 1: Amen brother.
by Firelovesugar April 20, 2009

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