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3.
Any sort of device that looks like a cannon and is generally designed to shoot potatos at a high velocity using household products as propellent. Also known as spud gun and potato launcher.
Using these lengths of PVC pipe, I intend to constuct a brand new potato cannon that will surely attract every twelve-year-old in the nieghborhood.
by Kurt Padilla July 12, 2004
 
1.
About 20 dollars of PVC and a grill ignitor put together to launch a potato at high speeds in excess of 300 feet. Sounds like a gunshot. Typicly made by bored, immature teenagers, but is incredibly fun to create/play with. If you shoot a potato it'll scare the shit out of everyone within 500 feet of you.
Last friday night some nerdy freshmen made a potato cannon and shot my front door. I then went outside and ran them over in my ford bronco.
by ThE GaMe!!! July 16, 2009
 
2.
The plural form of potato cannon.
"Look at how many potato cannons I've built!"
by KP July 14, 2004