Definitions by PHENOM87

t4p 

Primarily internet slang, and used as an acronym for "The fourth plateau," the highest level of intoxication, hallucination, and dissociation from the body when using the drug dextromethorphan, or DXM.

"Man, last night was crazy! I reached t4p for the first time on an 1100mg dose!"

t4p by PHENOM87 January 10, 2009