A moron with no friends or is homosexual. Therefore, their brain(s) is full of or made of smegma.
Bell end: I do it because black people do.
Other person: Your not black.
Bell end: *Looks at skin* Oh yeah!
Other person: Smegma brains.
Smegma brains, a term used for rather annoying people who are unaturaly red.
The term can also be used for a certain someone who gets there dashes ( - ) and apostrophies ( ' ) confused.
Finaly the term can be referrred to someone who has smegma breath.
"Hi andrew" said dongcan.
"Oh my god your breath stinks , ewwww smegma brains" said andrew.
Dongcan now turns into smegma brains.