A derogatory term for a person who often fucks up.
The term, chemlee, is taken from the television show, "Pawn Stars." The nickname of Austin "Chumlee" Russel, a employee of the pawn shop. (According to the show's web page, Austin's elementary school friends took the name from cartoon character Tennessee Tuxedo’s sidekick, a walrus named Chumley.) Austin is a viewer favorite because of his entertaining fuck ups.
Hey Chumlee...how do you expect the bird to cook if you didn't turn on the oven!