jammed /dʒæmd/ adjective3 •Stuck.The window is jammed shut.How to treat a jammed finger or toe. •Overcrowded; congested.Certain routes of the city are heavily jammed.These roads are hopelessly jammed with cars and mobile homes during holidays. •Rendered unusable by intentional interference.All their broadcasts are jammed.The jammed programming is being distributed on USB sticks instead.