psychedelic

Of, containing, generating, or reminiscent of drug-induced altered awareness, distortions of perception, hallucinations, etc.

Of graphics, etc.: having abstract shapes, bright colours, etc., reminiscent of drug-induced distortions of perception or hallucinations.

Awesome, cool, groovy.

Any psychoactive substance (such as LSD or psilocybin) which, when consumed, causes perceptual changes (sometimes erratic and uncontrollable), visual hallucination, and altered awareness of the body and mind.