cad, bounder, blackguard, dog, hound, heel -- (someone who is morally reprehensible; "you dirty dog")
Overview of verb blackguard
The verb blackguard has 2 senses
ridicule, roast, guy, blackguard, laugh at, jest at, rib, make fun, poke fun -- (subject to laughter or ridicule; "The satirists ridiculed the plans for a new opera house"; "The students poked fun at the inexperienced teacher"; "His former students roasted the professor at his 60th birthday")
abuse, clapperclaw, blackguard, shout -- (use foul or abusive language towards; "The actress abused the policeman who gave her a parking ticket"; "The angry mother shouted at the teacher")