rat bastard

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rat bastard

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.
See also: bastard, rat
Farlex Dictionary of Idioms.

rat-bastard

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
See also:
  • bastardly gullion
  • rats
  • rat
  • mf
  • not trust someone as far as one can throw him/her
  • take up with (one)
  • scurvy