head drug

(redirected from a head-drug)

head drug

slang A substance that affects one's mental abilities and/or mood; a psychoactive, often hallucinogenic, drug. Come on, you went to Woodstock—you can't tell me you've never taken head drugs before.
See also: drug, head

head drug

n. a drug that affects the mind rather than the body; a psychoactive drug. It’s these head drugs that get the kids into so much trouble.
See also: drug, head