When a girl starts off relatively decent, good morals, good job, lack of slutty tattoos but then starts dating a trashy guy and slowly declines to his level of trashiness.

someone who is sexy beyond mean

When a loser (scrub) impregnates a woman that earns a higher income, drives her to the point of insanity, so much she shaves her head, then gains custody over any offspring and then receives child support from the mother.

A hot or rich woman who has been knocked up multiple times by a man whom is not as hot or rich as she is. This is normally for the man to try and gain a lifetime of involvement with said (rich/hot) girl who would have probably just dumped him in a year or two if not for the kids. Getting "federlined" can sometimes lead to a hot woman not being so hot anymore. This has been named after Kevin Federline whom did this to Brittany Spears.