A trip shit is the act of shitting on the come up for amphetamine based drugs, i.e. Adderall/Ritalin, Ecstasy, Methamphetamine, etc.
The action of trip shitting is usually needed for some people, and most could agree, it feels wonderful.
Holy shit man! These fucking pills are starting to hit me! I gotta take a trip shit!
*in the bathroom yelling to freind*
HOLY FUCK! THIS SHIT IS AMAZING MAN!