"SHUUUUUUUUUUUUUSH FATTIES" *the world goes quite in realization that they have been called fatties but don't respond because they've been told to shush* SHUSH FATTIES is an expression used to easily get a bunch of people to stop talking.
The poor quality batteries that arrive already installed in electronic toys that you'd recieve on Christmas. Typically green and red, gold and red, or any combination of the three. And ususally weighing about half of what a duracell, or energizer would weigh. Toshiba is a common brand of Santa Claus batteries
person 1- Dude, did you get barreries for the digital camera?
person 2- Yeah man. They're those silver ones, ya know, the kind with the black cat jumping through the number nine.
person 1- Oh fuck! Those are like santa claus batteries. They don't even have the power to turn the camera on!