I have never heard fish-malk. o.o

I bet "grognard" is only used by grognards now

For the uninitiated, a grognard is a person who likes older style wargaming. The usage suggests a person who is older, set in their ways, and somewhat curmudgeonly. Often preferring how things used to be in the systems they grew up playing.

Generally speaking, they prefer a crunchy game with high mortality and grit, as opposed to a looser system with a narrative or character-driven focus.

For a term in more active use, I submit "crunchy" since I just used it. A game's crunchiness describes how complex the rules are - essentially how much number-crunching players have to do in order to play.

I use the following term from LARP into table-top

Bleed to talk about how in game drama impacts your emotion, it's usually positive, but need clear discussion to not end-up in horror stories

Black box for flashback/workshop where you roleplay something happening before the actual game. It can be used either to clarify link between characters (especially in one shot) or be used in games like Blades in the Dark to have PC jumping to action directly and doing the preparation latter

Then the obvious IC/OOC to clarify what happens. And some game-term which I export everywher like talking about the Malkavian or the lawful good