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At any Goan bakery, the oft-chanted mantra is - "maka pao dhya" (Gimme some pao bread)...Goans carried the same to Bombay, out of sheer habit, asking the baker to give them the pao-bread! Over time, it first shortened itself to makapao and then to Mac/ Mak, denoting a Goan Christian usually.
You don't like biff pattis*?! Not a real Mac or what?