flamer /ˈfleɪmɚ/ noun3 •(slang) One who flames, or posts vitriolic criticism.Send a note to the flamer. Tell him that his message was inappropriate. Request that he refrain from posting anything like it again. — 1997 •(informal, offensive) A very flamboyant ("flaming"), effeminate gay male. •(slang) A fireball.A Navy fighter was on the tail of a Jap dive bomber that was headed for the ships in the bay, and he nailed him at about 5,000 feet and made a flamer of him. — 1945 formsflamers