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FIRST, imagine a bullet sitting in the chamber of a gun.
...a round bullet, sitting in a round chamber, leading to a round barrel with a round muzzle.
...shoot the gun and the round bullet travels from the round chamber, down the round barrel and out the round muzzle.
NOW, re-imagine the same scenario with a barrel that has a "flattened" at the muzzle (like that exhaust tip).
...shoot the gun now and you get a KA-BOOM!
...why? Because round "things" (like bullets and gas "slugs") don't take lightly to sudden changes in geometry (read: pressure containment geometry) without equally sudden counter-reactions...like KA-BOOM!!
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