What happens among four teens in the 2019 play by Alexis Scheer, “My Dear Dead Drug Lord,” is the stuff of pubescent histrionics, paranormal activity, and parental nightmares. It would be hysterical if some of it wasn’t so feasible, teetering on the edge of funny shenanigans and deeply discomfiting actions. The barebones production, now playing in Braddock, is a twisty, trippy exploration into the lives of four young women who are determined to go dark, as a path into the light.