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1.
Short for "Battleground Hero".

A term used by World of Warcraft players to describe someone who spends a fair portion of they're playing time in PvP Battlegrounds, or someone who only PvPs in battlegrounds, as opposed to arenas.

Is often used in a derogatory fashion by higher rated arena players to essentially say another player is bad at PvP.
"BG Heros don't deserve gear of any kind."

"I'm a BG Hero because sandbox deathmatchs suck. I much rather play in a larger group with objectives like capturing flags and taking points."
by Level 1 Alt April 28, 2010