Rat bastard derogatory slang countable noun
Used to describe a person who is extremely despicable, untrustworthy and immoral
I was foolish enough to believe a rat bastard like him!
He abandoned his wife and children when he became rich. He's really a rat bastard.
Used to describe someone immoral or perverse, having a tendency toward sexual promiscuity
To refer to a very unpleasant or sneaky person whose manner is not sincere or moral