A more sexual version of a sleepover. Basically people show up in their PJ's, get stoned, and then procede to have all kinds of sexual experiences with the other guests, leading to a large orgy involving the host, all of the guests.
Guy1: Dude, Stacy's having a pajama jama jam, you going? Guy 2: Hell yeah!!!! No way I'm missing that!!!
by Xero _ Manifest November 8, 2010