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Adjective: hopped-up  'hópt 'úp
  1. (of an automobile) having the engine modified to give extra power
    "a hopped-up jalopy"
  2. Under the influence of narcotics
    "We were hopped-up most of the time";
    - stoned [informal]

See also: drunk, gone, inebriate, inebriated, intoxicated, powered, ripped [informal], skunked [informal]