expression, noun
last resort; final desperate measure
Idiomatic expression referring to a final, often weak or desperate, measure taken when cornered. Literally 'the weasel's last fart', evoking the weasel's defensive odor.
彼の言い訳はイタチの最後っ屁に過ぎない。
His excuse is nothing more than a last resort.
追い詰められた犯人がイタチの最後っ屁で人質を取った。
Cornered, the criminal took a hostage as a final desperate measure.