Wordnet 3.0
VERB (1)
1. 
 get high, stoned, or drugged; 
- Example: "He trips every weekend"[syn: trip, trip out, turn on, get off]
WordNet (r) 3.0 (2006):
trip out
    v 1: get high, stoned, or drugged; "He trips every weekend"
         [syn: trip, trip out, turn on, get off]