mutton /ˈmʌt(ə)n/noun 6adjective 1forms 1phrases 1 noun6 •The meat of sheep used as food; especially, that of adults. •The meat of a goat, urial, or other caprine.BAKED HASH HOW TO COOK AND PREPARE GOAT MEAT / By Mrs. Finley Gilchrist / We have used goat mutton for three years. Everyone likes it. Dress and cool 48 hours before cooking, except liver and heart. — 1920 •(slang) Em, a unit of measurement equal to the height of the type in use. •(historical) An old Anglo-French gold coin impressed with the image of a lamb. •(no longer used) A sheep. •(slang, no longer used) A prostitute. adjective1 •(slang) deaf.He's been a bit mutton in one ear for a long time; not due to my mother, but as a result of all the years spent working in a noisy car factory. — 2009 formsmuttons Phrases with mutton laced muttonA prostitute.