Fat Boy Swag or Fat Boy Struggle two meanings that can be used in a good or bad way.
Glenn: i cant believe you got that girls number dude
Jones: FBS! dude, i got that Fat Boy Swag
Jones: dude help me out of this jacket im stuck (starts to sweat and is struggling to breathe)
Glenn: haha "FBS" (Fat Boy Struggle)
Jones: Thanks man! (sarcasm)