Top definition
A being who is undoubtedly extremely intelligent, but lacks in every other single aspect of their lives, ESPECIALLY looks, charisma, and any other medium that makes an individual acceptable to society.
Dude, my friend is such a rubain, the only thing he would hit, are the books after a long hard day of being rejected from society

Omg, stop being a rubain, you're not that ugly!
by Trooll November 19, 2013
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