Far Realm
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Meta gaming is acting on, in any way, information known to you, but not to your character.
If your character is interested in other realms, secret lore, and planes you may find some interesting adventure, but it is ultimately up to a DM whether you come accross anything like the Shadow Weave, Far Realm, or another Netherese Enclave (Opus). You are not going to find, IC, any information on this stuff without there help.
Trying to manipulate the situation of what you know OOC so you can take advantage of it IC is meta gaming. Simple
PS. I played a character I had expressed OOC to DMs about the city Opus. Origionaly I was told it did not exist, but later on IC began to discover its existance. The big difference is I did not go looking for "secret lore about lost cities" or even planar lore. The DM exposed me to it as part of a plot and my character knew next to nothing about it.
The Far Realm is seemingly impossible to even reach since the only known portal collapsed and brung the elves that created it with it. But yeah very well said.