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
av sctso 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.
av Bradley Darren Davidson 14 november 2006
to be rad, and fantastic (not in a gay way)
man that game the other day was radtastic
av 1337solidsnake117 3 maj 2007
amazing; of top-notch quality.
Dude, last night's shenanigans were radtastic, were they not?
av AlanJohn 21 januari 2008
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!
av Devin Starr 15 maj 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
av asdfcodyjkl; 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!!
av Cindell Corbeil 19 november 2007

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