The art of using your penis or "wang" to "smash" someone's face. Usually shouting "WANG SMASH!" while, or just before executing the meaning is common.
Can also be used as an adjective meaning you are better than or "owned" a subject/person
Girl: *on knees unzipping Boy's pants
Boy: "WANG SMASH" *cock whips Girl's face, resulting in an embarrassingly shaped bruise*
Einstein: " and that is my Cosmological Constant."
Ninja: "Hey Einstein! You didn't account for the amount of Asians jumping up and down at the same time. WANG SMASH!"