Top Definition
An ache or pain located in the head caused by reading and writing in continuous caps lock, it happens because when you read caps lock it is like you are shouting over people, that arn't actually there.

There is no cure.
Reggie: AHHHH CAPS LOCK LOLOLOLOLOOL

Hasna: ouch, cap-ache.
by cap-ache victim #1 October 23, 2009

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