An inexpert or amateurish performer, especially a mediocre jazz musician.[as modifier] ‘recordings loaded with that “hamfat” band sound’
- ‘There were not a lot of jazz guitarists teaching in Richmond Hill, so at first I wasted some time studying with a local hamfat who tried to teach me stuff.’
- ‘These amateurs were called hamfatters and, later, hams.’
Late 19th century: perhaps an alteration of amateur.