A song by brokencyde is called Blue Steel.... a verse in it says Don't make me show you blue steel.
Actually, it is a reference to the movie Zoolander, which is a comedy. Ben Stiller's character (Zoolander) is a fashion model (and assassin) and he gives names to the poses he takes in front of the camera. One of the poses, which nobody can supposedly resist, is called Blue Steel. Although bluing is something that actually is done to gun metal to harden it (i.e. heating/plating with nickel), that is not what this particular song is referring to.
Reference is to a gun which is typically the process of Bluing the steel of the guns metal parts.
