Brain Ache 

When your brain starts to ache due to stress on your eyes.

If you try look at the back of your neck for about 15 seconds you will experience one.

They are fucking annoying.

Thought: Hey what's that lump on the back of my neck? I'll just check

15 seconds later

Brain Ache! Fuck that feels annoying!

Brain Ache by RoadkillSkip August 22, 2009

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.

E.g

Person one: Heya, how're you today?

Sufferer: uhhhhh

Person one: Whats up? Are you ok?

Sufferer: uhhh errrr brainache... meh

Brainache by Spoontastic January 8, 2010

Braincheck

When a girl is dying to give you some head but you just aren't in the mood for it -- you ask her for a braincheck.

Tim: Vicky really wanted to give me a blow job last night...

Ryan: So did she?

Tim: Nah, I had just hooked up with her room mate, so I asked her for a braincheck.

Braincheck by J Ganthier October 13, 2008

brainache

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.

Have you figured it out yet, brainache?

brainache by RadioElectric February 20, 2011