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3.
To think that something is so great that it is a mix between "sweet" and "fantastic" that it makes sweetastic!
Sam:"Hey Sophie! Your dads ass is sweetastic!"
Sophie: "I am going to kill you."
by Slammin' September 19, 2007
 
1.
1. awesomeness
2.sweet
3.fantastic
joni's cookies are sweetastic.

there is nothing more sweetastic than a corn dog.
by joni miller April 04, 2008
 
2.
Sweet and Fantastic put together.
Dude he just asked me out!

Thats sweetastic!!!
by Paige Kosinski January 17, 2009
 
4.
a word that i made up when i combined fantastic and sweet.
that movie was sweetastic.
by Kristen Stergios August 21, 2006