Why does the Saint call Bosley "Bombay Sister"?

Why does the Saint call Bosley "Bombay Sister"? - Career Lettering Text on Black Background

In Charlie's Angels (2019), Bosley meets The Saint:

Saint: Hey. Bombay sister. How are you?

Bosley: Master.

Why does he call her "Bombay Sister"?

dialogue charlies-angels

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Why does the Saint call Bosley "Bombay Sister"? - Close-Up Shot of Scrabble Tiles on a White Surface

Why does the Saint call Bosley "Bombay Sister"? - Close-Up Shot of Scrabble Tiles on a White Surface

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