Metagame is the way the game is currently played in a given area. Specifically, when players talk about the metagame (or 'meta', for short), they talk about which deck styles and strategies are the most dominant in their area of play; for instance, a Chaos Deck metagame, cards that are played the most often or used by the most people, it also can mean the cards that are available in that area (through local-leagues or casual trade circles), and the current state of the Semi-Limited/Limited/Forbidden lists (If the area plays by the Traditional or Advanced Format).
-September 09 Ban Lists Metagame-
The September 09 Ban lists hit a lot of decks such as Synchro Cat and Blackwings. Sine all of Rescue Cat, Summoner Monk and Gale the Whirlwind got limited to 1.
Here you can try to predict future Metagame.
Blackwings, Lightsworns, Gladiator Beast.
EDIT BY HYDRONIC: Black, you need to clarify your posts.