Top Definition
A baseball pitch, almost impossible to hit. Normally only thrown on a 3-2 count, and can be seen by noticing the fear in a pitcher's eyes when the Ole Dark One is signaled. A large mustache helps control the Dark One.
It was 3-2 and the catcher called for the Ole Darkball, and the pitcher obliged him.
by Mark Dickirson April 30, 2011
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