BIS
BIS definition by Slang.net
This page explains what the acronym "BIS" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Gamers use BIS to stand for "best in slot." You might encounter this acronym in gaming forums or in-game chat, when players are discussing equipable items such as armor, rings, shields, or weapons.
An item that is BIS is the best of its particular kind. Thus, it is the item a player should be looking to equip in that "slot." Which item is BIS may differ based on a character's level, class, and other attributes. So, for example, headgear that is BIS for one player may not even be usable by another.