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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
автор: sctso 28 апреля 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.
автор: Bradley Darren Davidson 14 ноября 2006
 
3.
to be rad, and fantastic (not in a gay way)
man that game the other day was radtastic
автор: 1337solidsnake117 3 мая 2007
 
4.
amazing; of top-notch quality.
Dude, last night's shenanigans were radtastic, were they not?
автор: AlanJohn 21 января 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!
автор: Devin Starr 15 мая 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
автор: asdfcodyjkl; 19 июля 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!!
автор: Cindell Corbeil 19 ноября 2007