My guess is that these keywords are "get into HNQ" cards.
I think that this is just a strategy to game the HNQ (Hot Network Questions)/reputation system. Using an obscure word will give your question much more exposure. Compare what happens when you see these two hypothetical questions on the front page:
- "Where's this small round hill in Idaho?" (Never been to Idaho, next question please.)
- "Where's this flubbub in Idaho?" (What the heck is a flubbub? Click!)
The latter gets you loads of views and interaction in no time, thus likely HNQ exposure, thus loads of rep in no time.
(Whether these are all the same person or several people using the same approach is a different question.)
IMHO the best course of action is to edit these words out and see what happens, especially whether the OP pushes back. If they don't, then it was probably just an odd translation or something.