Green’s Dictionary of Slang

tripped-out adj.

[trip out v.1 ]

1. (drugs) under the influence of LSD or another hallucinogen.

[UK]Guardian Guide 14–20 Aug. 12: Old guys doing switched-on, tripped-out tribal music.

2. disorientated, confused, upset.

[US]E.E. Landy Underground Dict. (1972).
[US]R.C. Cruz Straight Outta Compton 9: House niggers who weren’t even invited to sit on the stoop gave Flip, Billy’s tripped-out friend, an excuse to follow suit.
[UK]J.J. Connolly Layer Cake 174: I reckon I’d better eat cos otherwise I’m gonna get more light-headed, more and more tripped out.