I think the main issue we often see with these questions is that some believe the question is more of a general "is there a word in the English Dictionary for this thing" question. I believe in the past I've seen people get directed to the English Language & Usage SE site for questions like this.
While I think questions like this probably aren't very suitable, I think a question that is asking about a term specific to a game or collection of games does seem suitable for Arqade.
For example, lets pretend someone asked a question with the subject that boils down to What does the term bunny hopping mean? I would think that this is on topic, since bunny hopping is (arguably) a largely used term in the gaming community to describe a movement mechanic often exploited across a wide variety of games (even Wikipedia has a small section devoted to explaining bunny hopping as a video game term).
That said, the question that spawn this Meta post is a bit grey to me. I don't quite believe it aligns with what I said above. Though I can see sort of see it being on topic since it exclusively is asking about "video game apps" instead of apps in general.
To summarize, I like terminology questions where the term in question can conclusively be deemed specific to gaming and I think we should allow these kind of questions. But I might have just stumbled upon the next issue - how do we decide if a term is specific to gaming? Is this where we try to rely on the community to decide?