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The roots of this phrase are founded in Alborz High School in Tehran, Iran. "Chi" can be a suffix to tie a name with a specific profession or commodity, e.g. FarshCHI for a Carpet Merchant. It may have stemmed from the last name of charismatic Alumni with that suffix in their names! Doc (or Ostad -- Professor) was a common way for students or Alumni to address each other.
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