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.
When finance content creators rent out fancy cars and flexcash to seem richer than they really are in order to promote and sell their “get rich quick” courses.
The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.