Boomstick

The Boomstick is a shotgun found in Jungle Shrines. Each bullet fired from the Boomstick splits into three spreading shots. All three shots have a base power of 12, yielding 19 damage with Musket Balls and 21 damage per shot with either Meteor Shot or Silver Bullets. Highly effective at close range, hitting an enemy with all three shots can do around 60 damage, butchering most non-hardmode enemies.

Trivia
This weapon is a reference to films Evil Dead 3: Army of Darkness. Ash Williams: "All right, you primitive screw-heads, listen up! See this? This... is my boomstick!"