Originates from actors overacting in theater; useful to describe similarly excessive behavior in any performance. His hammy antics onstage made the audience laugh.
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Negative Connotation
Often implies a negative view of an overly dramatic and insincere performance, rather than being a compliment. The critics called his interpretation too hammy to take seriously.
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Humorous Effect
Sometimes used deliberately for comedy; excessive emotion or seriousness can be amusing. Her hammy sobbing in the comedy sketch was hilarious.