stoned

From Middle English stoned (simple past) and stoned, istoned (past participle), equivalent to stone + -ed. The etymology for the sense of "exhilarated, intoxicated by substances", which originated in American English in the mid-20th century, is not fully clear. It could be derived from stone drunk, a common slang expression from the mid-19th to early-20th century. It is more frequently theorized to be a phono-semantic matching of Italian-American slang stunod (“dazzled, stupid”), from Italian stonato (“out of tune, off-key”). In 1952, Life Magazine listed it in a glossary of bop musician slang, in the sense of "drunk, captivated, ecstatic, sent out of this world" (see quote).

出典: Wiktionary「stoned」（CC BY-SA 4.0）