tripper

noun

1.
(slang) someone who has taken a psychedelic drug and is undergoing hallucinations
mindfarer
2.
a walker or runner who trips and almost falls
stumbler
Derived from:
trip
3.
a tourist who is visiting sights of interest
excursionist rubberneck sightseer
Derived from:
trip
4.
a catch mechanism that acts as a switch
trip
Derived from:
trip