When a girl has a crush on and/or wants to bone her male friend ("bro"). Often, the girl is considered "one of the guys" and is deeply rooted in the friend zone. Lady broners are usually unsatisfying and may result in late nights alone, self-loathing, and bitterness.
Girl 1: It's great that you and Herp are such good friends.
Girl 2: Yeah, except for the fact that I have a massive lady broner for him.
Girl 1: You are fucked.