Fat pockets are essentially "pockets of fat" that can be found almost anywhere on the body. They are commonly called lovehandles, double chins, thunderthighs, and kankles. These "pockets" are basically large and noticeable groupings of fat. They are embarrassing and WILL attract negative attention.
1)"Eww... check out those fat pockets hanging out of Catie's enormity... she should put on a damn sweater."
2)"Jesusgod, Taylor, my eyes! Them fat pockets of yours are fucking nasty!"