A bullet bill is a powerful bullet about the same size as mario when he is little, used by bowser to stop mario from saving the princess and rooting her.

Mario Jumps on top of these to kill them, but constantly shoot out of a cannon in attempt stop him.

One of the greatest but forgotten enemies of the Super Mario Bros. Games.
Bowser shot a bullet bill at mario just before he finished the level, the guy playing was very annoyed
by Example555 April 05, 2009

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