Wǒcào, zhème nán de tí tā shí fēnzhōng jiù zuòwán le?
Holy shit, he finished a problem this hard in ten minutes?
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Very vulgar. Like English "fuck!", it reacts to shock, anger or amazement and is not aimed at anyone. 操 stands in for 肏, the character the swear word really belongs to. Softer disguises are 卧槽, 我靠 and 我去.
mistakes
操 on its own is an ordinary word, 'to operate; to exercise', as in 体操 'gymnastics' and 操场 'sports ground'. Only the swear word is read cào.