Brainache

A condition under which the sufferer's brain physically aches. The brain shuts down normal functions and refuses to work with you to achieve anything.

Leads to confusion, inertia, drowsiness, blank staring, unresponsiveness, nonsensical gibberings, numbness of the senses, difficulty in forming or grasping simple thoughts and concepts and immobilisation of the body.

Commonly a result of overindulgence in intoxicants of various forms, lack of sleep and/or workaholism.

Used as an insult to denote somebody of limited cognitive power. The implication is that they find the act of thought so difficult that it causes their brain to ache.