godan verb (-ru), transitive verb
fire ceaselessly; shoot away; blaze away
Describes continuous, intense shooting, often with a sense of unleashing a barrage. Used in action scenes, games, or metaphorical attacks.
敵に向かって銃を撃ちまくった。
He fired his gun ceaselessly at the enemy.
ゲームで弾を撃ちまくるのは楽しい。
It's fun to blaze away with bullets in the game.