A Nanny who is hired not primarily to take care of someone’s children or house, but instead to be a companion for the home owner.
Jen: Did you meet Loretta’s new Nanny?
Shaniqua: Yes. She hardly paid any attention to the kids.
Jen: Damn straight, and Loretta spent the whole evening chatting with her like they were just friends.
Shaniqua: Oh yeah … she got herself a companionanny.