Meaning

noun a seductive woman who uses her sex appeal to exploit men

noun playful behavior intended to arouse sexual interest

verb talk or behave amorously, without serious intentions

origin1553, from the merger of Early Modern English flirt (“to flick”), flurt (“to mock, jibe, scorn”), and flirt, flurt (“a giddy girl”). Of obscure origin and relation. Apparently related to similar words in Germanic, all of apparently onomatopoeic origin, compare Low German flirt (“a flick of the fingers, a light blow”), Low German flirtje (“a giddy girl”), Low German flirtje (“a flirt”), German…

Etymology from Wiktionary, CC BY-SA 3.0