Top Definition
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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