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mixed from the words sexy, man, and beast, used to describe a guy who is overly sexy. it is a word that is good to use in public that most people dont understand.
look at that smeast! hes soo hot!
by swimmer_laura March 27, 2009
combined words to descride some one thats a sexy man beast
" Alex is such a smeast"" I know i want him"

"I'm such a smeast" "sure u are ;)"
by italiano man :) August 29, 2007