When is metagaming GOOD metagaming?

[Mightypion]

His thing with eating things nobody should be trying to bite saved his live from a Succubus champion.

She grappled him, kissed him, read his mind, understood where else his mouth already had been and got nauseated from that.

It was in wotr, hearing of this, Nocticula added in a clause forcing the parties squaky clean Cleric of Shelyn to look after the Bloodragers dental hygine procedures.

[I'm So Meta Even This Alias]

As long as the game doesn't turn into a self-aware sentient strange loop and try to absorb the players into its consciousness... although now that I type that out, it sounds pretty awesome.

[Goth Guru]

My go to GM tool for players speaking to npcs as themselves is to have them treat them as crazy. It's a common condition among adventurers.