I don't have one (and sometimes others don't).
Mom: Think before you act
Me: Can't, I don't have a brain
something that many people lack. Some have it but refuse to make it of use, matter of fact many of us have it but it has cobwebs because of lack of use. Please use your brain!
stranger: omg do you have a brain?
stranger2: you mean that pink thing in my skull?
stranger1: yeah!
stranger2: ya! but i just don't use it
stranger1:brainless!
a pink bag of mush, that holds knowledge
your brain should know this already
brain:something you clearly dont have a brain if your searching up brain
jack:yo how do you write russia
thomas: R U S S I A
jack: thanks! man
thomas:*whispers* u need to get a brain
A shortened form of "Braindead," commonly used when something braindead happens, or someone is being braindead.
Friend 1: *does something retarded*
Friend 2: "Shut the fuck up you are so brain!"