the mother of a man's child when the parents are not married

The mother of one's child. The connotation is that mother and father do not and never did have any relationship beyond being sex partners. Contrast: ex-wife, ex-girlfriend.

some chick you knocked up on accident during a fling who you can't stand but you have to tolerate cuz she got your baby now.

Baby momna takes the child support money that is enough for rent for a 3 bedroom apartment, in New York City on 5th Avenue, and take the money and spends it on herself, when the money is supposed to be used to take care of the child, and she will not buy the child any clothes and The child must call her daddy and beg him to her new clothes for school, cause the kids are picking on her old clothes. The father takes the child shopping, and the Baby momma tell the child "Daddy and his wife are rich, so make sure you get everything you can. When Baby daddy drop the child off, Baby momma is expecting Baby daddy to bring food back for the rest of the other baby daddy kids.(other kids had for other men.)

Making some poor man life a LIVING HELL because she won't take her good for nothing ass to work. She just lay around having babies living off good men. Making all women look bad.

the mother of your child, not necessarily your mate/life partner

Some one who takes the money that she is supposed to use to take care of the kid and spends on a rental car for the summer, buys hair, gets nails done and pretends to be a baller with her child support to impress all her friends who all thinks she is a loser for losing such a good man. Normally attempting to make some poor man life hell because she was to sorry to keep him.

The mother of your children out of wedlock.