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1.
Definitely. A common mis-spelling that has propagated itself virally (see "meme").
People commonly misspell definatly. I mean definitly. I mean definitely.
by Curumbor Elendil February 11, 2005
 
2.
Definitly(so common an error that some people consider it as internet jargon)
I am Definatly an Urban Addict.
by Light Joker August 27, 2004