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Someone who joins a game in most common circumstances Modern Warfare 2 to block slots so that several people in the game can boost.

The aim of the lobby locker is to fill the slot so that a random doesnt join the game and spoil the boosting session. The locker usually just roams the map without interfearing with the other people gaming.

Lobby lockers can range in numbers from 1 up to however many.
Hey John we need to get some Lobby Lockers for our boosting session later, lets see if we can get some
by Jaison Chamsine January 04, 2010
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