大おお外はずれ

noun

utter failure; completely wrong guess; big miss

Used when a prediction, expectation, or attempt is completely off the mark. Often carries a colloquial, emphatic tone.

• 天てん気き予よ報ほうが大おお外はずれで、ピクニックは中ちゅう止しになった。

  The weather forecast was a complete miss, so the picnic was canceled.

• 彼かれの予よ想そうは大おお外はずれだった。

  His prediction was way off.