Damn, how did you lose so much weight all of a sudden?
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Casual filler interjection, stronger than 哇 but weaker than 卧槽. Originated as a polite euphemism for the vulgar 我操 - the 'I go' substitution lets you vent without swearing.
usage
Only spoken/informal. Don't use in writing to teachers or superiors. Often doubled as 我去我去 for extra surprise.
