ぶっつけ本ほん番ばん

noun

performing without rehearsal; doing impromptu

Describes going into a performance, presentation, or event without any prior practice or preparation, often with a sense of boldness or recklessness.

• ぶっつけ本ほん番ばんでスピーチをした。

  I gave the speech without any rehearsal.

• ぶっつけ本ほん番ばんのプレゼンは緊きん張ちょうする。

  An impromptu presentation makes me nervous.