iserith
Magic Wordsmith
What other definition of metagaming is there? What do you mean "until everyone agrees". It seems like a clear definition in every place that defines the term. Seems like it's already universally agreed what it means.
Experience over the decades that this topic has been discussed has shown that people come to the table with different ideas of what that means, ranging from the definition you offered to "That thing you do that I don't like." So, if there's to be a discussion about "metagaming" - and for the love of god, why would we want that - it's helpful to agree on a definition before moving forward.
In any case, the poster you quoted wasn't talking about "metagaming." He or she was talking about the "metagame."