1) When a person jumps into the water from a high height to produce a large splash.
2) An Atari game long out of commission.
3) When someone wears too little clothing into a public shopping area, while also being obscenely obese.
Dude! See that chick? What a Human Cannonball!
Eew, do you see the human cannonball on aisle 3?
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A person who is rather large and known for running through people.
We were watching the footy and saw our senior coach absolutely run through a kid like a human cannonball.