A woman who gets pregnant to trap a man into eighteen years of slavery.
Did you hear about Frank? His girlfriend got knocked up when she thought he was going to leave her. She is such a pregator!
A overly possessive girl that seeks (or hunts) a guy (or prey) and gets pregnant from him just so she can use it as an excuse to stay with (or keep) him forever. Sometimes, the target male doesn't necessarily have to be the child's father.
Bob: Man, Hilary is so hot and awesome and I think she likes me, I'm totally going for it.
David: Dude, you gotta be careful around her, she's a total pregator.