The only one I've ever known was a guy who literally spent his whole days smoking pot and sitting on his couch. I allowed myself to be conned by someone I knew into letting this idiot move in with me for a little while before I knew him- needless to say, that didn't last long. I didn't allow illegal substances in my house (nor would my other roommate at the time who was also a close friend), but he'd happily head over to a friend's house to have daily quota of weed every day before plopping back on the couch (or in his room). I think he was really, truly lazy- did not care about anything but the above, didn't bother trying to pay his part of the bills (which quickly led to a throwing-out), and the one time he DID have money to pay with, went out and spent on a DVD set instead
That's the only person I"ve ever known that I thought was truly just lazy for the sake of being lazy.