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Turns out I'm not the only one! Here's a spirited discussion on HN from 2019 in which a number of commenters note they have no clue what it means, or else have had it wrong all along:

https://news.ycombinator.com/item?id=19781756

tbf i only started using it the other day after i googled it myself (though I dimly remembered it from the past).

I've normally used OP (as in Original Post) but that can get confused with Original Poster (and the initial comment rather than the featured article).

TFA is more specific and now that I've learned it I think its valid to use on a board where it is likely to be a regular useful shortcut.

It was widely used on slashdot, I just assume that people who use this Three Letter Acronym (TLA) are also /. refugees

TLAs FTW!