the use of remarks that clearly mean the opposite of what they say, made in order to hurt someone's feelings or to criticize something in a humorous way
"You have been working hard," he said with heavy sarcasm, as he looked at the empty page.“你工作真卖力，”他看着空白页狠狠地挖苦说道。
Compare: irony(TYPE OF SPEECH)
Idiom
sarcasm is the lowest form of witidiomsaying挖苦是最低级的幽默;挖苦乃刻薄之举
said to mean that sarcasm is unkind and not very funny