Top Definition
Used to describe your brother-from-another-mother. Need only be a twin of personality to be a Twinn, but physical depiction is extra credit. The word first came into use in 2005 in an AIM conversation when a mistype of "twin" happened across the chat-box.
Twinn, you should probably look up the meaning of epos also.
by Epos Twinn July 10, 2008
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