While playing a game, press R, Black, L, Black, Left, Down, Right, Up, Left, Down(2), Left. A note will confirm that you entered the code correctly. The moderate powered weapons in each category will be unlocked, including the flame thrower and sniper rifle. Enabling this code will cause your street creds to drop in points. You can check your creds in the stats menu at the pause screen. If you are in the negative, you are a Playa-Hater.