哭哭哭哭卟了牵肠挂肚念念念念卟了魂牵梦绕
[kū kū kū kū bŭ le qiān cháng guà dù niàn niàn niàn niàn bŭ le hún qiān mèng răo]
A very expressive and poetic way of expressing profound longing and heartache, where 'crying' and missing someone so much can't be controlled; literally, it's about crying uncontrollably because of deep yearning and constant missing thoughts which are entangled around the intestines and haunting dreams constantly.