Woman to woman

It comes from the song “Woman to woman” by Shirley Brown. It means that said man is cheating with someone else.

Hence why the song builds up to “ So woman to woman. I don't think it's being anymore than fair. Then to call you and let you know where I'm coming from” to explain to Barbara (from Shirley’s POV) that the man she’s seeing is already spoken for.

Natalie: Do you think Richard is attractive? He’s been flirting with me for a week now.

Janice: ..Woman to woman.. Richard is seeing someone for 6 years now.