Meaning

verb have amorous affairs; of men

verb talk or behave amorously, without serious intentions

originFrom the given name Philander, used as a name for flirtatious characters in several 18th century stories, from Ancient Greek Φίλανδρος (Phílandros), name of the mythological son of the nymph Acacallis and the god Apollo. Semantically disconnected from the adjective φίλανδρος (phílandros, “loving one’s husband; excessively attracted to males, slutty, boy crazy”).

Etymology from Wiktionary, CC BY-SA 3.0