What word or phrase does your mother always say?
"amorous, flirtatious person," 1690s, originally of both sexes (as it was in French), from French coquet (17c.), diminutive of coq "cock" (see cock (n.1)). A figurative reference to its strut or its lust. The distinction of fem. coquette began c.1700, and use in reference to males has faded out since.