throw your goats up

To make either the "Anarchy" or "Goats' Head" hand sign by using your thumb to hold down the middle and ring fingers, while extending the index and pinky fingers. Most often seen at cheese-ball metal concerts, i.e. Slayer, Metallica, Pantera, etc. And some punk concerts i.e. Black Flag, AFI,
Sinead O'Connor

Bro, they're about to play Ride The lightning man, awesome dude, throw your goats up so they know we're hardcore, blood, death, satan, yeah!!!!!