Mr "Trencherman" FM
Down here we use it is sentences such as: "In the space of the last five years, he fearlessly gained 40 pounds, displaying a trencherman's appetite for life and an admirable disdain for cardiologists and Surgeon Generals whining about moderation.."..
Doesn't anyone else?
Trencherman is from trencher, "a wooden board or platter on which food is served or carved" (from Medieval French trencheoir, from Old French trenchier, "to cut," from Latin truncare, "to lop off, to shorten by cutting") + man. It is related to trench, "a hole cut into the ground."