Cross between love-rat and bastard. Term means anyone who is coniving, and who makes sure their partner is the last to know of their activities.


Non-puristically, It is used as a general insult to anyone.

A commitmentphobic who carelessly or negligently mistreats daters as a direct result of said commitmentphobia. Ratbastardly actions center around lying, cheating, ending dating relationships irresponsibly.