BoA - acronym for "Bind on Account," which is a item type in the popular massively multiplayer online game World of Warcraft. BoA items are soulbound to the account of the player that attains the item, and thus can only be traded to the account holder's alts. The item scales to whatever level the item holder is, and levels up with the character. Generally these items also have a stat that grants 10% more experience from quests and monsters, making these excellent questing gear. Also, at lower levels (59 and below) you'll be hard pressed to find items with better stats, thus many twinks buy these items.
"BoA items killed battlegrounds for non-twinks..." as a player is killed by a druid wearing golden armor.