A term or phrase given to an otherwise shit gun, people around the world use this to explain how shit WWII guns were or any gun they hated.
John: Dude you know the M1 Garand is Pistola De Vitila?
Bill: Wha- What the fuck does that even mean.
John: I dunno just looked on Urban Dictionary, it just mean that gun is shit.
Bill: But... M1 Garand isn't even shit?