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a keyboard, playing surface, piano or midi controller with an erect key or keys. This malformation is typically due to damage caused by sporadic movement while demonstrating the proper rock-out technique for foot movement, thereby striking the stand on which the keyboard had once rested, causing it to fall to the ground. See also keyboard mashing.

Dude, when you foot-rocked that live tv performance, keyboardicus erectus was born.
by April 16, 2009
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