It is the devil eye, symbolising six six six, and it is meant as such when someone does it. To put one's eye through the loop makes the all-seeing eye. Many a cod musician has taken up the gesture, as both an attempt to join the masonic movement and also to witness, much as christians do, only in the case of the peacock eye / 666 gesture it's witnessing to Lucifer, their half-inflated dark lord (half inflated just like Rover?).
And let's follow the trail of feathers, even if they are horse )Denver Mustang( feathers... Peacock Eye, Peacock Angel, Melek Taus... LUCIFER Rising.