Wikipedia
Psych-Out (1968) is a counterculture-era psychedelic film about hippies, psychedelic music, and recreational drugs, produced and released by American International Pictures. Originally scripted as The Love Children, the title when tested caused people to think it was about bastards, so Samuel Z. Arkoff came up with the ultimate title based on a recent successful reissue of Psycho.
Director Richard Rush's cut came in at 101 minutes and was edited to 82 minutes by the producers. This version is the one released on DVD. For some reason, when HBO Video released the film on VHS, they used a 98 minutes long version. On February 17, 2015 there will be released a 101-minute Director's cut on DVD and Blu-ray DVD. The majority of the songs in the movie and on the original soundtrack album were performed by the Storybook. This credit is never mentioned on movie posters and articles. They were a local band from the San Fernando Valley.
Usage examples of "psych-out".
Jordie's going to have to do the best damn psych-out in front of the Council committee he's ever done in his life.