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(also feed cap) A peaked cap like a baseball cap, bearing the trademark or name of a manufacturer and distributed as an advertising device: She made him stop wearing his John Deere gimmie hat in public places/ a ''macho'' gimmie cap emblazoned with ''Cat'' (for Caterpillar Tractors)
[1970s+; probably fr the request ''gimme one of those!'' heard when these were available free from dealers]