Top Definition
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
dari sctso Senin, 28 April 2003
(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.
dari Bradley Darren Davidson Selasa, 14 November 2006
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!
dari Devin Starr Jumat, 15 Mei 2009
something so fricken cool you couldm't even use the normal word "rad" to describe it!!
that was SO radtastic!

you are very radtastic
dari asdfcodyjkl; Sabtu, 19 Juli 2008
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!!
dari Cindell Corbeil Senin, 19 November 2007
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