scabby

scabby
adj (-ier, -iest)
(a) covered with scabs (scab 1) 结痂的; 有痂的.
(b) (sl derog 俚, 贬) contemptible 卑鄙的; 下贱的
    You scabby liar! 你这个卑鄙的撒谎的人!

牛津英汉双解词典