满嘴跑舌头
mǎn​zuǐ​pǎo​shé​tou

to talk nonsense

  1. 满嘴 滿嘴 mǎn​zuǐ adjective
    to talk exclusively of
    to speak entirely in a certain language or constantly use certain words such as lies, promises, or nonsense
  2. 跑 pǎo verb
    to run around
    to walk or go to places; to run about doing things or running errands, such as for business or reporting news
  3. 舌头 舌頭 shé​tou noun
    tongue
    the tongue of a person or animal; used for tasting, chewing, and speaking