P.O.S. (born Stefon Alexander), is a rapper signed to Rhymesayers Entertainment and a founding member of Doomtree. Biography Naming P.O.S. began as a punk rock musician. In high school, Alexander and his friends played punk shows in a band called "Om," in which he first came to be referred to as "Pissed Off Stef." The abbreviation has taken on various and indefinite meanings including, "Product Of Society," "Promise Of Stress," "Promise Of Skill," and "Piece Of Shit." Entering rap At first hostile to hip-hop, as many of his fellow rock musicians were, Alexander soon realized that rap was an alternative, valid method of expression. He began creating music that was increasingly influenced by the genre, despite having very little respect for mainstream rap. In 2001 P.O.S., along side rapper Syst (short for system) and DJ Anamoly (Jason Heinrichs) existed as a short-lived hip-hop group called