Originally a street term, LSD trip is now generally accepted to denote a "phantasmagoria of hallucinations, "illusions, and "sensory distortions, following each other in a kaleidoscopic fashion and occurring within the context of intoxication with " lysergic acid diethylamide (LSD). A person seeking LSD trips for the purpose of exploring the psyche may be called a " psychonaut.
References
Cohen, S. (1964). Drugs of hallucination. London: Secker & Warburg.
Dictionary of Hallucinations. J.D. Blom. 2010.