くそみそにいう
Meanings
Expression
Verb (5-dan, う)
1. to verbally attack; to run down; to criticize severely; to speak disparagingly of
Composed of
severely (criticize, run down, etc.); terribly; harshly; unable to differentiate the good from the bad; (valuable and worthless things) treated the same
to say; to utter; to name; to call; to go (e.g. "the alarm went ping"); to make a noise