A gun that fies by having its bolt operated by a chain. Despite years of misuse (started by id game's Doom) it is always a single barrel gun.
The M2A2 Bradley IFV uses a 25mm chaingun
by Colin Ritter August 06, 2003
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A Chaingun Cha-Cha is when you shoot someone repeatedly with a sub-machine gun or machine jun while the person is standing up.

The Cha-Cha bit is where the person judders with the force of each bullet, but doesn't fall down.
That noob danced the Chaingun Cha-Cha
by Kelly Osbourne's Gimp April 20, 2004
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