Swamp bacon is a type of salt-cured meat. Swamp bacon is prepared from several different cuts of meat, typically from the belly or back cuts from rodents of unusual size. It is considered a delicacy by those unfortunate enough to reside in a swamp and have little to no access to proper bacon, and is generally considered superior to having no bacon at all.
Dude just ate a whole plate of swamp bacon, and now is having a nap.