Described is a spitball gun that is operable for collecting, wetting, and projecting paper ammunitions. The spitball gun includes a paper advancing chamber having an opening for receiving paper ammunition and an advancing mechanism for advancing paper through the paper advancing chamber to a loading chamber. A water tank is also connected with the loading chamber. An indexing lever is used to cause paper to be pulled through the paper advancing mechanism while water is released onto the paper from the water tank. A firing pin handle with a connected paper cutter is used to cut the paper and load the paper into the loading chamber. Finally, air from an attached air tank is used to expel a wetted paper wad from the loading chamber and through the barrel of the spitball gun.