dirt rat
Someone who is just plain dirty, looks like they haven't showered in a month, and when you looks at them you get a chill down your spine. The biggest dirt rats have big teeth.
Eww, teresa looks so ugly, shes such a dirt rat.
Dirt Rat
A undesirable skeevy person, usually also a drug addict or general criminal, or a proud lower class alcoholic New England American with no values......
ya Johnny, that fucken dirt rat. Get a job, ya dirt rat. Ya nutin but a dirt rat