Used to express not giving a fuck, but when not giving a fuck doesn't go far enough. A bakers fuck has an inverse relationship to a bakers dozen. Where a bakers dozen includes one extra, a bakers fuck includes one less. Hence, not giving a bakers fuck is giving even less fucks than usual.
The delivery is very important. You must always have a slight pause after the bakers and heavily emphasize the fuck.
When a small group of people enclose themselves in a small room and load all of their pipes. You start them all at the same time, and you have to scream "bake-fuck!" as soon as you take a hit.