Airhead Share definition Flag A person who lacks street smarts/common sense. Forgetful, ditzy, or absent minded. Often used as a characteristic for a stereotypical blonde. It is important not to link airhead to stupid. It is possible to be airheaded yet have book smarts. The car battery is dead because she left her headlights on again, what an airhead. Airhead by cupk8 May 27, 2018 Get the Airhead mug.