Smoke-tag. To hit someone with a smoke grenade in Gears of War. Smagging is similar to Frag tagging, where one sticks a grenade that is actually lehtal to someone. Smagging, however, does not kill. It only maims the pride.
"Aw, son of a bitch! I killed him, but he smagged me. What a bastard!"
"God Damn it! He smagged me and ran off!"
"Ha ha, look at that jackass I smagged. You can see his trail of smoke as he runs off and hides."