I think the word is is an early Hithcock invention, back in the 30s. Think of North by Northwest. The Mcguffin is a microfilm, but who cares about that. Incidentally, I used to wonder about the title of that movie, until the visual pun dropped.
There is a scene at an airport; Cary Grant is getting an airline ticket, and being briefed by Leo G Carroll. He is going to fly north to Mt Rushmore; the airline is Northwest.
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