Definition of duffers:
(n) :
(informal) An incompetent, indolent, or clumsy person.
(n) :
(sports) A player having little skill, especially a golfer who duffs.
(n) :
(dated) A cow that does not produce milk or produces substantially less than her peers do.
(n) :
A racing pigeon that does not perform well.
(n) :
(Australia, dated) A cattle thief or thief of other livestock; one who alters the brands of cattle.
(n) :
(archaic) A pedlar or hawker, especially one selling cheap or substandard goods.