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