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1.
The shadowing or darkening of an obvious light source, causing a dingy area... in most cases nauseating to behold.

For example, the layered car wreckage on the loading screen of Burnout Revenge, causes a shamhole when the car's drop shadow slides in front of a brilliant exploding fireball.
Dude, how dare you use a shamhole!
You're shamholing my style.
Popen my shopen... and while you're at it, jamhole my shamhole.
by Mendelgamer November 02, 2006