An attitude to life which leads inevitably to morbid obesity.
A combination of severe laziness, arrogance and mental retardation which means the root cause of ones obesity will never be fully addressed or rectified.
Quote: "I can't eat fish unless it's battered and fried" "That's because you've got fattitude"
Weighing 300lbs and having the fattitude to telephone your non-obese partner to provide a beer delivery service direct to your sofa/bed, rather than get off your fat arse and risk burning calories.
Destroying several sofas by the sheer mass of ones arse and then blaming the manufacturer, rather than your own fattitude.