When a man , especially when he's with his female, turns his back on another male to show he is not in the least
intimidated.
Like the
silver backed gorilla - The Alpha male may mate with all the Alpha females & has first pick of food. When a guy shows his
superiority over another male by daring to turn his back towards the other.
Stella: "Did you see Brian silver back that crazy, huge German last night? I thought I was going to have a heart-attack."
Harry: "It's a man thing - that guy was really askin' for it." "Don't
underestimate Brian, he's not afraid of shit, anywhere. He's a sleeper in strength, lighting fast, & he's got
endurance." "Notice that idiot calmed down after Brian silver backed him?"
Stella: "Yeah he did. I guess
you're right."