Excess poundage in the buns (booty or buttox) resulting from half-assed dieting and half-assed exercising.
"Bundage" is a portmanteau from the combined words of "poundage" and "buns."
"In his delusional world of doing everything half-assed, he believed his workouts and protein dieting would give him the body of Adonis but instead all he did was up his bundage."
Having an extra large booty which could make doing anything improbable.
1. Kid can hit the baseball, but he can't run! All that extra buttage slows him down so he's always thrown out at first!
2. Her extra buttage is causing the threads of her jeans to pop!
James: Oh damn! Look a that girl's ass. I'd hit it from the back, right lads?
Bob: I'd have a go on her.
Horatio: Oh quite! That is the professional bunnage we all know and love.