Green’s Dictionary of Slang

abbey-lubber n.

[SE abbey + lubber, f. OF lobeor, swindler, parasite; the word is the origin of the nautical use; the abbey lubber also describes a demon, haunting monasteries and supposedly the ghost of a drunken, idle monk]

[mid-16C–early 18C] a lazy monk; a reproachful name in regular use after the Reformation.