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1.
To make big plans but not follow through with them
Kieran was going to go to stay in Australia for a year but he smythed out after 2 weeks
by GildoBaggins October 17, 2008
 
2.
Another way to write the name "Smith", with the silly notion that it actually makes the person with the name seem more unique, when they really aren't.
Joe Smyth?
It's prenounced SMITH, but spelled with a "y".
Why?
by Louie Ed June 26, 2008