违心玩笑
[wéi xīn wán xiào]
'Wei Xin Wang Xia' means 'A Joke Against My Heart' or 'Insincere Joking.' It suggests the action of joking around without true heartfelt intent behind those words, or even putting on an appearance to amuse others while one's real intentions differ, hence showing insincerity or inconsistency in behavior.