Originated in Tony Danza's mythic early days as a porn star. His signature move was said to be a mushroom welt (cockslap), during which he'd shout out his surname.
A sex move: While you are having sex with a girl from behind, you ask her "who's the boss?" When she replies you are, you remove your cock from her vagaina and say wrong Tony Danza bitch. Yell bitch and jam your cock as hard as you can into the sluts ass.
While doing a girl from behind you slam your cock into her ass while simultaniously slapping her on the back of the head exclaiming "Who's the Bossnow Bitch!"
aight sometimes when a girls giving you head she'll ask you to let her know when you're gonna cum so you dont cum in her mouth. well a danza dunk is when you're about to blow it and you hold her head down while yelling "Who's the boss?!"