expression, ichidan verb
make a pass at; hit on; flirt with
Colloquial idiom for making romantic or sexual advances, often with a playful or slightly aggressive nuance. Literally 'to sprinkle powder on'.
彼はパーティーで女の子に粉をかけていた。
He was hitting on a girl at the party.
あの人はいつも誰かに粉をかけてるよね。
That person is always making a pass at someone, isn't he?