mullet /ˈmʌlɪt/noun 10forms 1 noun10 •A men's hairstyle where the hair is kept short on the top and sides and long at the back.– Mullet head, don't touch the back – Cut the sides, don't touch the back — 1994 •A fish of the family Mugilidae (order Mugiliformes). •A fish of the family Mullidae (order Syngnathiformes). •Those of the genus Mullus within that family. •(US) Any of several species of freshwater fish in the sucker family. •(US) Those in the genus Moxostoma. •A fool. •(slang) A person who mindlessly follows a fad, a trend, or a leader. •A star with straight edges and usually with five or six points. •A rowel of a spur. formsmullets