A "Barndo" is a rednecks condo. Half of building is used as a pole barn and the other half is the living space.
A barn that has been transformed into a barndominium aka "Barndo".
Jimbo has it made livin' in that there Barndo, he can work on his truck, walk a few feet to his bedroom & get his dick sucked, step back out to his kitchen & get some brisket to eat, then hop into his shower to cool off from the Texas heat, without goin more than 30 feet.