By definition:

“Metagaming is a broad term usually used to define any strategy, action or method used in a game which transcends a prescribed ruleset, uses external factors to affect the game, or goes beyond the supposed limits or environment set by the game. Another definition refers to the game universe outside of the game itself.

In simple terms, it is the use of out-of-game information or resources to affect one’s in-game decisions.”

It is also defined in Dice Masters as the most current and top played cards in the game at any given point.