A technique used by games involving rushing in and shooting the enemies without any thoughts to tactics or strafing, by use of holding down the W key (in a WASD configuration) and the left mouse button. Expression originated from Team Fortress 2
"God, I hate those W+M1 Pyros, they have no skill!"
"W+M1 wins again!"
"I can't believe I died to a W+M1."
"W+M1 takes no skill."