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.
"I thought I was getting a fuck buddy, but I ended up with a baby momma."
a bitch that you get knocked up on accident but now you gotta deal with because she got your baby
Mark just found out that he got his ex knocked up in 7th grade and now hes a junior in high school and now he got two kids that he just learned about and a bitch for a baby momma
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.
