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Noun: dirty dog
  1. A person who is deemed to be despicable or contemptible
    "only a dirty dog would do that";
    - rotter, rat, skunk, stinker, stinkpot, bum [N. Amer], crumb, lowlife, scumbag, so-and-so, git [Brit], scuzz [N. Amer], slimebag, ratbag [Brit], scuzzball [N. Amer], sleazebag, scuzzbucket [N. Amer], toad, dirtbag [US], scuzzbag [N. Amer], slimeball, sleazeball

Derived forms: dirty dogs

Type of: disagreeable person, unpleasant person