When a girl is very loose, you take one fist and ram it into her vagina as far as you can. Then while your doing that, you take your other hand and ram down her throat hopefully killing her immediately and right after yelling "HULK SMASH"
Note* You need to hit fists the best was you can while screaming at the top of your lungs *
While performing anal sex on a girl, the guy pulls his dick out and punches the girl directly in the asshole inserting his fist. The act is not complete until the man exclaims: "Hulk Smash".