Top Definition
A combination of Kung-Fu, Ju-Jitsu, Tai-Chi and Yogic Meditation it involves razor precise movements of the forearms and is very difficult to master, as King Roger has discovered. After months of practising he is still only at the level of First Jam. There are seventeen Jams to pass through before you achieve the level of Grandmaster, each one is a test of such things as survival, bravery and cookery!
Rodger used JimJamYAHA to knock am man from his bike without touching him.
by Am June 18, 2004

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