1. A name to give a woman by a man who wishes/fantasizes they were the real baby daddy, usually regretting the person they are with.
2. A woman who's baby daddy isn't around and her male friend will take on the "daddy" role or claim the kid/kids and call her his baby mama.
3. A lesbian who has a baby daddy, marries/dates anoher lesbian who has children, and the baby daddy claims them as his and calls the woman his other baby mama.
Tyrone & Megan was hot back in the day; she was his everything but they broke up & had kids with other people. Now Tyrone and Megan is kickin' it again and he wants her, so he claims her kids and calls Megan his pseudo-baby mama.