A "rocket barrel" refers to a barrel that is equipped with a rocket engine. It can be used for flying or launching rockets into space.
Sentences with «rocket barrel»
Or maybe it will be the damned rocket barrel riding portions, which are probably accurate representations of riding a wooden barrel with a flame shooting out the back. (kotaku.com)
The infamous rocket barrel still handles poorly due to its momentum - based controls, especially in tight corridors. (gamerassaultweekly.com)
The fourth Rocket Barrel stage in the game. (mariowiki.com)