@Felthry I don't think I knew about SO until way after I learnt most English
it's pretty common in definitions, yeah… do you not use English dictionaries from time to time?
@noiob only rarely, and not usually for phrases where that would show up
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@noiob if we see an unfamiliar phrase, it's usually slang and would be easier to just ask the person who said it what it means than to find a dictionary that bothers to include this specific slang
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@noiob I would guess, assuming that abbreviation is similarly common in dictionaries/textbooks (we've never seen it though), that it's less likely to enter common use just because of namespace conflicts: there's the word so and SO (significant other) in very common usage that would be easy to confuse with it if it was used
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