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1.
'Battle cry' of the notorious smith, front man and lead saxophone player for smith and the smithsons.

The phase first became popular in the Essendon area of Melbourne, and has now been adopted by Australian youth nation wide. While it had its origins as a battle cry, 'SMIIIIITH' is now used as a form of 'vigorous exclamation' for any situation.
johns football team yelled; 'SMIIIIITH' to get revved up to their football game
by moonie waters June 11, 2010