Coined after a wrestling move, it is a phrase often used by a person (who in most cases will be jacked and tan) to imply that he will literally "shoot" his body in on another person, grab both of their legs, lift them up, and proceed to drop them on their neck. The person "shooting" may grunt during the move or arm-pump afterwards to assert their dominance. Can also be followed up by a "monkey stomp."
Art is so jacked, he can shoot a double on a 500 pound boulder.
Art got so mad at the kid that he shot a double, dropped him on his neck, then monkey stomped the back of his head multiple times before walking away.