The fake email name used when signing up for websites. Usually created by mashing your hands on the keyboard then adding "@yahoo.com".
Guy 1: "Dude, this porn site wants my email address before I can see the premium stuff..."
Guy 2: "Screw that, man. Just use a qwertymail address..."
Guy 1: "Of course! Qwertyuiopasdfg@yahoo.com it is!"