PMG stands for Poor Man's Gin, an alcoholic beverage perfected by a young aspiring Canadian. The official recipe calls for 3 parts vodka, 1 part 7up/Sprite/Mountain Dew, and a bunch of lemon. Top it off with some ice, and you are guaranteed to have a good night.
The PMG is much more deadly and powerful than an SMG. A Football Helmet should be worn when drinking a PMG, so you do not injure yourself throughout the night.
dude 1: I had four PMG's last night at nick's party, and threw up all over his bathroom. I had two more PMG's to wash out the taste of vomit in my mouth.
dude 2: NIIIICE!