steamed /stiːmd/ adjective2 •Heated and processed by steam, such as being cooked by steaming.Superintendent Chalmers: Why is there smoke coming out of your oven, Seymour? / Principal Skinner: Uh– Oh. That isn't smoke. It's steam. Steam from the steamed clams we're having. Mmm. Steamed clams. — 1996 •(informal, figurative) Angry; hot under the collar.He was steamed that the car cut him off. It took almost half an hour for him to calm down. formsmore steamed · most steamed