a collection of fat on and around the body of a lazy arse dad - belly, face, chin, arse or all of them
dad1: "Hey, its been a while how are.. whoooa what the hell is all that?"
dad2: "Oh man, thats my dadfat, too much sitting about eating crap food has taken it toll on me."
dad1: "yeah id say, you got loads of dadfat there!"
dad2: "So have you by the looks of it!"