1. rotter - Noun
2. Rotter - Proper noun
a person who is deemed to be despicable or contemptible
Source: WordNetonly a rotter would do that Source: Internet
kill the rat Source: Internet
throw the bum out Source: Internet
you cowardly little pukes! Source: Internet
the British call a contemptible person a `git' Source: Internet
Next, Rotter called his housemate, Steven Mosher. Source: Internet