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To "smack your melon" means to hit your head, or noggin on something hard enough to cause a negative physiological reaction, such as a concussion, any cut or abrasion on your scalp, seeing stars, or even just getting a noticeable headache thereafter. It is usually caused by an inadvertent or unexpected action, such as tripping and falling down, being the victim of a noggin knocker, hitting your head on the dashboard or steering wheel of a car during a crash, or even misjudging the height of a tree branch, or some other low-hanging object, and stupidly hitting your top knot against it while passing by.
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