a word that seems to merge three senses of hop; the meaning "flavored with hops" (hop (n.1)) is first attested 1660s; that of "under the influence of drugs" (hop (n.2)) is from 1924; that of "excited, enthusiastic" (perhaps from hop (v.)) is from 1923. Meaning "performance-enhanced" (of an engine, etc.) is from 1945.