A good job, or snack easily got: also shellfish growing at the bottoms of ships; a bird of the goose kind; an instrument like a pair of pincers, to fix on the noses of vicious horses whilst shoeing; a nick name for spectacles, and also for the gratuity given to grooms by the buyers and sellers of horses.
BARNACLE
Meaning of BARNACLE in English
Slang English vocab. Английский сленговый словарь. 2012