The act of acquiring firearms to go to war with a rival Gang, Crew, Set etc.
Used often in the series "The Wire"
Drug Dealer: Look man, all I'm saying if I'm gonna take you're package, split me and be fair. I got to pay all my people the same, and here you're upping the price on me.
Marlo Stanfield: Pay you're people less.
Drug Dealer: They my people, though.
Marlo Stanfield: Then short yourself... Split is 60/40. If you want better? You need to Tool Up
and wait for Chris, Snoop, and the rest of my people, come pay a call on you're people.
Snoop: We will be brief with all you motherfuckers, I think you know.
Drug Dealer: A'ight. (Drug dealers walks away to go tool up).