Derived from someones sn and the word wonderful. This word is used to piss off a certain someone and be cute at the same time. Normally it is followed by or is a precursor to a verbal attack normally towards the the certain someone and not really the other way around.
Isn't that cyntastic!
by Flippy December 07, 2004
A word which is used whenever something great happens. This could also be used to sound sarcastic.
"You drove all that way in the snow? Now THAT'S cyntastic!"
by Meli Khushrenada August 12, 2003