It's a Shirazi phrase, Shiraz is a city of Iran. Shirazi people use "amoo" alot in informal conversations. When you don't agree with someone you say "boro amoo" to show you disagree. Or like "come on" in English
2015년 3월 22일
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It is used to show surprise or disbelief, similarly as "Get out of here!" or "No way!" in English.