Butt Cannon

No comment necessary.

"I've got machine guns... in my butt?!"
Astro, Astro Boy

Exactly What It Says on the Tin; a ranged weapon integrated within the character's buttocks. Often used as a surprise attack.

Compare Shoulder Cannon, Leg Cannon, Arm Cannon, and Chest Blaster. Not to be confused with Fartillery.

Examples:

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     Anime and Manga 

     Western Animation 
  • Teenage Mutant Ninja Turtles (2012): The season 2 trailer depicts an ape-like Kraang-droid with dual machine guns in its butt, much to Donnie's shock. About 0:20 into this video here.
  • ''The Grim Adventures of Billy & Mandy: In the episode "It's Hokey Mon!", one of the many eponymous Hokey Monsters has a literal cannon in its butt, which another Hokey Monster loads cannonballs in manually.
  • Evil Con Carne: In the Pilot Episode, Hector gets a new robot body with all sorts of functions, such as butt rocket launchers. When he uses them, however, he destroys most of his base and puts himself in mortal peril.