□

biū
  1. (onom.) pew! (sound of a bullet fired from a gun)
  2. also pr. biù

CEDICT

onomatopoeic

Homographs

□ biàng
  1. (Tw) (coll.) cool
  2. awesome
  3. (etymologically, a contracted form of 不一样 bùyīyàng)
  4. often written as ㄅㄧㄤˋ
□ gīng uptight; obstinate; to awkwardly force oneself to do sth (from Taiwanese, Tai-lo pr. king, often written as ㄍㄧㄥ, no generally accepted hanzi form)