說溜嘴 [说－－]

Jyutping syut3 lau6 zeoi2
Pinyin shuō liū zuǐ

Definitions (CC-CEDICT)
  1. to make a slip of the tongue
Definitions (Wiktionary)
  1. verb, idiomatic
    to say the wrong thing without thinking; to make a slip of the tongue; to let slip an inadvertent remark