Yes, TRIPPERS is a Scrabble word!

Letter values in Scrabble US: T 1, R 1, I 1, P 3, P 3, E 1, R 1, S 1.

Is it a valid word?

TRIPPERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(slang) someone who has taken a psychedelic drug and is undergoing hallucinations
a walker or runner who trips and almost falls
a tourist who is visiting sights of interest
a catch mechanism that acts as a switch