Lag (A.K.A. Input) is a term often used in the Smash Bros. series to describe how long it takes a move to start up or cool down. An example would be Ganondorf's Warlock Punch, which takes an extremely long time to use in exchange for heavy damage and KO potential. This makes the move laggy, as opposed to other quick to use moves.
It can also refer to the delay one encounters when playing online or with certain TVs. However, dealing with the Internet. Most people say that Super Smash Bros. Brawl has terrbile lag during Online Play.
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