Metagame
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 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).
Currently, the most popular decks which are more commonly used are Blackwings, Six Samurai, Gladiator Beasts X-Sabers, Machina Gadgets, Gravekeeper's, Infernities, Quickdraw Dandywarrior, Scrap, Plant Synchro and Perfect Heralds decks. Other notable Decks are Flamvells, Counter Fairy, Dragons and Naturia.