I find that much of the time, it'd be easier just to say what the two words are, and explain it for those who don't find it obvious.
This troper says the problem with TWOT is a matter of over and misusing. People use it in contexts that they aren't actually obvious. It seems obvious to them, in a way it seems obvious to me what my real name is, but you may never know if I never tell you.
I think the primary problem is that people see it done so often they're desperate to do it themselves ... just like the WMG pages are full of "X is a Time Lord" with no explanation, like that by itself was a joke. Memetic Mutation, bandwagon thinking, etc.
Fan Myopia is a BIG contributor to this. Believe it or not, not everyone is so well versed in every single anime character, video game level or sci fi series.
Wasn't the page previously just named Two Words? Heck, Two Words is still a redirect. The whole point of using the trope is to point something out, so the two words in question are obviously not obvious to someone. So why say call it obvious?