To commit war crimes in a video game made by the developers of Bohemia Interactive. Armaing is often very violent but joked about by people who do it as if they have no regret.
(to) arma
Person 1: Hey man, I just armaâd an entire village!
Person 2: Wow, thatâs awesome! I might arma later today
Person 1: Do you want to arma today?
Person 2: Sure do, what gamemode are we playing?
Person 1: We are doing a scenario in the Bosnian war