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A person who is very much into taking the recreational drug Acid (LSD = Lysergic acid diethylamide) to the point where it begins to affect his or her psychological balance. Or such a person who used to take large amounts or take the drug frequently enough in the past to have induced various mental health problems such a schizophrenia or a more general psychosis.
You can't believe his stories. He's an acid freak.

She's not just paranoid, she's an acid freak. She took so much in the 60's it's really fried her brain.
by VLUK December 11, 2006
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Acid freaks are people who drop LSD, a psychedelic drug popular in the 60s. LSD was legal in the 60s after being created by accident, but is currently illegal. Acid Freaks may seem slightly schizophrenic by being paranoid, or seeing things that aren't actually there. Every acid freak needs a buddy while they're under, and every stoner needs an acid freak. LSD opens the deep horizons of the mind, and enlightens those who use it. LSD has been used by iconic geniuses such as Ken Kesey, Hunter S. Thompson, Aldous Huxley, and Allen Ginsburg. These are beat generation authors of the 60s. LSD nicknames include California Sunshine, Battery Acid, Blotter, Acid, Purple Heart, and Golden Dragon.
Basil: Did you see how much acid Charlie dropped last night?

Maryjane: He's been doing that since the third grade.
Basil: Dude's an acid freak!
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by gonzovibe November 09, 2017
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