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The act of a person committing suicide by jumping from the roof, window, or balcony of a high-rise building.

The "Jam" is derived from the description of the person semi-literally 'splattering' as they hit the ground, while the "Mile" is derived from the long fall between the jumping spot and the ground.
Hotel Babylon quote: "It's much better if they fly the Jam Mile. You know when they jump off their balconies? It means we're not responsible for clearing up the goo."
by AcidCookie July 22, 2009
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