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a fat dwarf who has a high opinion of himself and spends all day trying to inflate his ego by writing his musings on the internet. Can also mean an avid fan of Avril lavigne.
John was a right twat, a total smess infact.
by Red Eye September 20, 2003
Short for SMS, or text message.
Girl: Hey, why didn't you reply to my s-mess?
Boy: Because I don't like you.
by Celebi+ August 31, 2011