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1.
Rad and fantastic combined making a force to be rekoned with. If you are radtastic you are the best.
That movie was so radtastic i bet it will get great reviews
por sctso 28 de Abril de 2003
 
2.
(adj) Something so great, or tremendous, and unbelievable that it supersedes all other synonyms of both good and extraordinary.
Although she was nothing more than an iconoclastic misanthrope, she had to admit that her adversary's discovery was radtastic.
por Bradley Darren Davidson 14 de Novembro de 2006
 
3.
to be rad, and fantastic (not in a gay way)
man that game the other day was radtastic
por 1337solidsnake117 03 de Maio de 2007
 
4.
amazing; of top-notch quality.
Dude, last night's shenanigans were radtastic, were they not?
por AlanJohn 21 de Janeiro de 2008
 
5.
The most rad'st thing that can come up to mind
Dang T.A.K is like the most Radtastic skate crew out there man!
por Devin Starr 15 de Maio de 2009
 
6.
something so fricken cool you couldm't even use the normal word "rad" to describe it!!
that was SO radtastic!

you are very radtastic
por asdfcodyjkl; 19 de Julho de 2008
 
7.
To be Incredibly amazing, both RADical and fanTASTIC at the same time.
Bob: Hey, Guess what cindell, it's friday.

Cindell: AGAIN??? ARE YOU SERIOUS??

Bob: yep.

Cindell: OH MAN, THAT's SO RADTASTIC, I HARDLY KNOW WHAT TO DO WITH MYSELF!!
por Cindell Corbeil 19 de Novembro de 2007