This is a relative guideline when judging whether or not a woman is fat. If her belly sticks out further than her tits, she's fat. But if her tits go out further than her belly, she's not.
A woman with "A" cup sized breasts and a mild fat over pussy area (FOPA) can be considered fat, while one "C" or "D" cup with the same FOPA wouldn't be. Breast implants are highly encouraged to reduce the amount of fat bitches in the world.
The act of placing ones face in a woman's cleavage while the woman shimmies, jiggles or otherwise moves her bosom, or "tits", in a sweeping, back and forth, generally horizontal motion similar to a drive-thru carwash.
"Dude I can't believe you just payed two hundred bucks for 3 songs in the champagne room! Did she touch your penis?"
"No, but I did get a 25 minute tit carwash."