ba·nan·as
 /bəˈnænəz, Brit bəˈnɑːnəz/  adj  , not used before a noun
   informal   : crazy
   If you ask me, that guy is bananas. [=nuts]
   You're driving me bananas [=driving me crazy] with all those questions.
   All the noise drove me bananas.
  go bananas
    informal   : to become very excited or angry
    The crowd went bananas [=went crazy] when the concert began.