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A dinosaur that goes to parties, raves, and the like on psychedelic drugs which are but are not limited to:(Lysergic acid diethylamide) LSD, ecstacy, or shrooms.

Dinosaur can refer to tall people, beefcakes and the like.
X: Hey did you guys see Marklar at the rave last night?

Y: Yeah man...he got big.

Z: Dude, he's a psychedelic tyrannosaurus rex, fo sho.

Marklar: Huh?

Example #2:

A: Dude check it out. that guy there is trippin' hard.

G: He's totally a psychedelic tyrannosaurus rex.
by psychedelictyrannosaurusrex December 06, 2010
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