バシッと

adverb

with a whack; with a smack

Describes a sharp, forceful hitting or slapping sound or action.

• 彼かれは机つくえをバシッと叩たたいた。

  He smacked the desk with a whack.

adverb

directly; definitively

Used when answering or responding in a clear, decisive, no-nonsense manner.

• 質しつ問もんにバシッと答こたえた。

  He answered the question directly and definitively.