Deadbeat Parent
A pitiful, disgusting coward who decides that their new house, or their hot new girlfriend/boyfriend, or the boredom they're enduring is more important than the well-being of the children they raised. They seem to think that once they cum, their responsibilities for the well-being of their children end. Their complement are single parents, some of whom are irresponsible and reckless but others of whom are courageous, brave, hard-working and loving (depending on the individual).
Most deadbeat parents are males, and thus make sexist arguments about the mothers being whores to pretend that their actions aren't their fault. A deadbeat father's best friends are beer, a car to flee in, his ex-girlfriend's own hard work (for which he'll never give her credit for) and legalized abortion. But there are deadbeat mothers too. Regardless of gender, all are the lowest form of animal life (next to child-molesters and racists).
The rates of starvation, crime, sexual assault, poverty, and just about every other bad thing on earth would go way down if we didn't have deadbeat parents who left their husband/wife on the street to fend for the family while they partied.