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An extremely despicable, untrustworthy, immoral person. I took Charlie in because his sister begged me to help him out, but that rat bastard robbed me while I was sleeping! There's no way I'm trusting a rat bastard like that to run my company.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a really wretched or despised person. (Rude and derogatory.) Stay away from Albert, he’s a real rat-bastard when he’s drunk.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.