One who is really messy when they sleep. For example, excessive drooling, pissing, or wet dreaming, or possibly all three of these.
Devin: Hey Sean. Have you heard that George sleeps with a plastic bedsheet?

Sean: Yeah, I have. There's like a lake of piss every time he sleeps. Oh and do you know that kid Chris?

Devin: Yeah. His pillow gets soaked whenever he sleeps on it. I think he might have a drooling problem.

Sean: They are such messy sleepers.

Devin: Agreed.
by doctord0192 November 23, 2007
Get the messy sleeper mug.