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So apparently "dunder" isn't a new thing, just an alternative name for the well-known magic methods ("double-underscore methods"), which as far as I can tell never took off... (never heard the term before this video, and googling it, all I can find is references to the phrase being suggested on the python mailing list, but not used in the wild)

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I have actually heard "dunder" used in conversation multiple times at Python meetups. I think it's more useful in verbal conversation.

I usually hear it used to replace the phrase "double underscore". For example: "a dunder call method can be used to make an object callable".

Can confirm "dunder" used frequently at PyCon. Personally I prefer "under under".

It's fairly commonly used amongst core devs and on the python-dev mailing list. It's rarer in the wider ecosystem because... most python developers don't really refer to dunder methods often enough to need a shortcut for it.

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