Synset

a person who is deemed to be despicable or contemptible
<noun.person>   freq. cnt.: 4 freq. cnt.: 2 freq. cnt.: 1 freq. cnt.: 1

bum

crumb

dirty dog

git

lowlife

puke

rat

rotter

scum bag

skunk

so-and-so

stinker

stinkpot

sample sentences

"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'"