Top Definition
commonly diagnosed on little league and high school baseball teams, this is a crippling condition that leaves a pitcher unable to perform tasks requiring physical or mental stress the day before, of, or after pitching
"Hey, why isn't Kevin running with us today?"
"Dude, I heard he came down with a nasty case of pitcheritis. We should probably just leave him alone before his start tomorrow."
by K-Sheezy April 27, 2010

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