Definition of Ratbag

Noun: ratbag 'rat,bag
Usage: Brit

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