Short for Battle Buddy. A term used in the US Army to describe a good friend, someone you would trust with your life, and team mate in a military unit.
Soldier 1: Hey battle, cover my 6 while I clear this room.
Soldier 2: Roger that battle.
Just like u've got the cell in Biology and as u've got the atom in Physics,
u've got "battle" as the core of Hip-hop.
Hip-hop without MC's battling on the mic or DJ's battling on the turntable is incomplete!
If u're doin' rap and u ain't got no battle, it's like u're in a boat and u ain't got no paddle.