The title of the Ghosts film is a reference to what Cantonese slang term that is used in Cantonese to refer to Westerners, and applies to European ethnicities in its unmodified form.
Gweilo:  Cantonese speakers frequently use "gwailou" to refer to Westerners in general use, in a non-derogatory context, although whether this type of usage is offensive is disputed by both Cantonese and Westerners alike.
i don't know