Something you probally don't have.
What? Am i right or you lost something here? Just keep reading the other definitions for brain.
1. Cerebral prowess, smarts, wit, exceptional knowledge; the greyish pink electric mush inside your skull, dura matter
2. An extremely sought after zombie delicacy.
1. If you had as much brains as guts, what a clever fellow you'd be!
2. Braaaiiiiiinnnnnsssss!
Sponge like tissue that is connected to the nervous system that sends sensations through the body, they're responsible for the 5 senses: taste, touch, smell, sight, hearing.
The way he feels is right if it's one of the senses listed above that's telling his brain.
I have a small one, what about yours?
Mine is small, but that girl has a big brain!