Calling me gay in a video game only makes the urge of wanna ♥♥♥♥ your dad stronger

1960s–1970s, zipper +‎ head. Used by soldiers during the Korean and Vietnam Wars; multiple hypotheses exist as to the specific origin. One is that if an East Asian person were shot in the middle of the forehead with a machine gun, the head would split as if being unzipped; another, that the appearance of tire tracks on a body having been run over by a military Jeep or that of tank tracks resembled a zipper.