That point where a person has lost all function of ones self, not to be confused with just being "drunk". Riv drunk is past the point of drunkenness where passing out is inevitable however, a person is primed to go missing from friends in this state of consciousness.
"Did you see Jim last night!? He was totally RIV DRUNK!"
by 98Dynasty April 12, 2019
Get the RIV DRUNK mug.