Uncle Sid
Uncle Sid
slang LSD (lysergic acid diethylamide), a synthetic hallucinogenic drug. Possibly derived from a phonetic shortening of "acid" (a common slang term for LSD), with "Uncle" added for humorous effect. There were a few people passing around tabs of Uncle Sid at the concert. A: "What the heck is wrong with Tom?" B: "Oh, just tripping on Uncle Sid. He'll be fine."
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