Whay you call that fatty fat fatterton you work with who not only snoozles, but shamlessless snores like a chainsaw with a loose throttle. Sometimes their office door if open, sometimes it's closed. Either way, it's loud. Also prone to absolute denial when confronted about it.
Can also be used as a pre-fix to someone's name.
Todd: Hey, did you walk by Sleepy's office?
Matt: Which Sleepy?
Todd: Sleepy Jay
Matt: Oh, Jay-zzz?
Todd: Yeah, that is one sleepy lying fat fuck.