丈二金刚摸不着头脑
zhàng'èr​jīn​gāng​mō​bu​zháo​tóu​nǎo

to be at a total loss

  1. 丈二金刚 丈二金剛 zhàng'èr​jīn​gāng
    to be completely baffled
    Used as part of a set phrase with 摸不着头脑 mō​bu​zháo​tóu​nǎo to describe being totally confused or unable to make head or tail of a situation.
  2. 摸不着头脑 摸不著頭腦 mō​bu​zháo​tóu​nǎo
    to be at a loss
    To be unable to make any sense of a matter or understand what is going on; to be completely baffled