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.
The weather forecast was a complete miss, so the picnic was canceled.
His prediction was way off.
Standard kanji-kana mixed spelling.
All-hiragana spelling; softer and less common than mixed forms.
Katakana spelling of はずれ adds emphasis; common in casual writing.
Compound of 大 (おお, 'big') and 外れ (はずれ, 'miss, failure'). The exact historical derivation is straightforward; the word is a transparent emphatic form.