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1.
Expression used to show how awesome somthing is by combining "amazing" and "fantastic"
That concert was amazingtastic
by Kinimod April 20, 2009
 
2.
This word is for when you come across a person that isn't just "Amazing" or "Fantastic"; the upgraded form of "Amazing" and/or Fantastic.
Malia Dawn Jones, you truly are Amazingtastic.
by Freddie Rocks September 28, 2010
 
3.
When you are both Amazing And Fantastic
BETSY IS AMAZINGTASTIC lol love you betsy lol
by sean lyons April 26, 2008