Definition of Tripper

Noun: tripper tri-pu(r)

(slang) someone who has taken a psychedelic drug and is undergoing hallucinations
A walker or runner who trips and almost falls
- stumbler
[Brit] A tourist who is visiting sights of interest
- sightseer, excursionist, rubberneck
A catch mechanism that acts as a switch
"the pressure activates the tripper and releases the water";
- trip