on a trip

on a trip

slang In a drug-induced state, often one resulting from the ingestion of psychedelic drugs such as lysergic acid diethylamide (LSD, or "acid"). Ken's acting so weird, like he's on a trip or something. Did he take anything with you guys? Good luck having a normal conversation with someone who's on a trip.
See also: on, trip
Farlex Dictionary of Idioms.
See also:
  • bad trip
  • be on acid
  • on acid
  • mellow yellow
  • drop acid
  • LSD
  • come down hard
  • crank bugs
  • high
  • wear (one's) apron high