rotter
dirty dog
rat
skunk
stinker
stinkpot
bum
puke
crumb
lowlife
scumbag
so-and-so
git
scum bag
a person who is deemed to be despicable or contemptible
only a rotter would do that
kill the rat
throw the bum out
you cowardly little pukes!
the British call a contemptible person a ‘git’