Duffers have never really been straight shooters-on or off the golf course. The original duffers of the mid-18th century were shysters of the first order, merchants who palmed off trashy goods as if they were highly valuable (they often implied to unwary buyers that the goods had been smuggled and were very rare). Over time, the meaning of duffer was extended from a no-good peddler to anyone who was "no good," not just because the individual had low morals, but because he or she was incompetent or stupid. The term has been applied to hopelessly bad golfers since the late 19th century.