A "Danza Slap" is when a man slaps his erect penis derisively on the face of the woman who is giving him a blowjob. The genesis of the phrase can be found by watching the x-rated movie "Insatiable" starring Marilyn Chambers (1980). There's a scene where Ms. Chambers is getting rudely f'ed by her rich daddy's gardener on the pool table in the mansion. Being of low social standing, the gardener delights in "danza slapping" rich-girl Marilyn many times. The key though, is that the gardener (played by David Morris) actually looks like Tony Danza! I sh*t you not. Check it out.
Being a billionaire, Anthony thought it was his right to danza slap any women who gave him head.