The bouncer is affected by gravity: it goes down when you shoot it. It bounces on every wall it touches and can go very far: it disappears after about 30 tiles.
The bouncer is a horizontal rectangle with semi-circles on its left and right sides. It is blue with a vertical white line in the middle. It is slow.
It can also be used to defend your area: shoot a lot of bouncers to prevent anyone from entering. It is especially useful for the CTF Base.
Eat your lima beans, Johnny.