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Re:Retro collectors are uncovering hoards of old data by dragonwriter on Saturday October 30, 2021 @05:05AM (#29047240)
> I would have no qualms about labeling it incorrect American English. No one I've mentioned this to has ever even heard of the term.

It is absolutely American English, but dated. The people you know are probably just too young; if you have doubts here is a New York Times review of the American blue movie titled Blue Movie which uses “blue movie” (as well as “stag film”) to refer to the class of films to which Blue Movie belongs:

https://www.nytimes.com/1969/07/22/archives/screen-andy-warh...

Re:Retro collectors are uncovering hoards of old data by thaumasiotes on Saturday October 30, 2021 @05:24AM (#29047319)
Stag film is a term I'd recognize, though I'm not familiar enough with it to use it.