1lit. not to know whether to laugh or cry (idiom)
2both funny and extremely embarrassing
3between laughter and tears
Examples
wǒ我zhēn shì真是kū xiào bù dé哭笑不得。
我真是哭笑不得。
I do not know whether to take it as a compliment or an insult.
我哭笑不得。
I don't know whether to cry or to laugh.