crusty /ˈkɹʌsti/noun 4adjective 3forms 3 noun4 •(UK, informal) A tramp or homeless young person with poor cleanliness. •(UK, informal) A member of an urban subculture with roots in punk and grebo, characterized by antiestablishment attitudes and an unkempt appearance. •(slang) Dried eye mucus.Against the backdrop of muted stripes of color, Julieanne picked at her eyes’ crusties, and then combed her hair with the hand. — 1999 •(slang) Dried blood or serous fluid buildup following body piercing.Actually, I usually don't see crusties for up to a week after a new pierce, it takes some time before a new pierce is in that stage when it's actively pushing out dead skin cells and other gunk. — 1996 adjective3 •Having a crust, especially a thick one.No one was there. But there was a cloth spread upon the table that stood against the wall, and a cover was laid for one, with a crusty brown loaf and a bottle of wine beside the plate — 1899 •(informal, figurative) Short-tempered and gruff but, sometimes, with a harmless or benign inner nature.However kindly a friend may otherwise be, he soon turns crusty if asked to lend money. — 1895 •(informal) Of very low quality; crude visuals or harsh, granular sound.The door opened with a crusty squeak that echoed in the silent room.The old vinyl record made a crusty crackling sound as the needle hit it. formscrusties · crustier · crustiest