A shabby person or an unpleasant, deceitful landlord
Example: "So then the mumbling cove told me he was raising my rent 25%. Can you believe that? Also, his tattered coat was hideous."
A policeman, especially one tasked with harrying street prostitutes
Example: "I ain't telling you nothing, mutton shunter. Stop laughing, it's an insult!"
Example: "Oh man, I'm so scared of birds, I can't even go outside if there are too many out there. I guess you could say I'm pigeon-livered. But please don't, I fear pigeons the most."
A general term of abuse; a rogue or an eccentric
Example: "Sheena is a total ratbag. I'm not sure why I don't like her, but she sucks."