[JohnBooty]

    Even when I don't know the answer I manage to 
    salvage the situation anyway (They asked me what
    "regularization" was in a data science interview, 
    I had no idea, they told me, and then I told 
    them all the ways I had done regularization.)

Yeah I've found that interviewers are interested in your thought process, not rattling off canned quiz answers.

I do something similar whenever I'm unfamiliar with a term like that in an interview.

First, I never bullshit. I'm VERY upfront about not knowing a thing - but like you I say, "can you define that term for me -- perhaps I know it by another name" and more often than not, yeah, I can talk about how I've been doing it or something similar to it. And if not I get to have a discussion about the term and learn something, at least.

(Tangentially, being upfront about not knowing a thing gives you more authority when you state that you do know a thing...)

This field changes so quickly, I don't think any interviewer ever expects you to know more than a % of the topics broached, but they do expect you to be able to converse reasonably about all of them IMO.