發神經

发神经
fāshénjīng
  1. (coll.) to go crazy
  2. to lose it
  3. demented
  4. unhinged

CEDICT

colloquial

Entry Composition

1 發 fā
  1. to send out
  2. to show (one's feeling)
  3. to issue
  4. to develop
  5. to make a bundle of money
  6. classifier for gunshots (rounds)
2 神經 shénjīng
  1. nerve
  2. mental state
  3. (coll.) unhinged
  4. nutjob