They're jargon
to you.
"Hit points", "class", and "level" are all jargon too. To somebody. Do you explain what they mean at the beginning of every post? Why not?
@Campbell was clearly throwing out those terms as
examples, because we aren't actually talking about those things. But if he were actually talking about those things, based on my interactions with him, I'm pretty confident he would either establish the context (this discussion is about Game X and its terminology) or he would explain the terms as needed.
That some people do toss subculture or personal terms around, I do not dispute, but something else is going on here in the blanket objection to jargon as "any term I personally am not familiar with".