something so fricken cool you couldm't even use the normal word "rad" to describe it!!
that was SO radtastic!

you are very radtastic
by asdfcodyjkl; July 19, 2008
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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!!
by Cindell Corbeil November 20, 2007
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(adj.) a word that describes something that is so far beyond amazing that this is the only word to describe it.
Teacher: Does anyone know what the synonym for-

Jack: RADTASTICAL!

Teacher: No, Jack. And you really should really start raising your hand-

Jack: -BUT, I DO!

Teacher: Yes, Jack. AS you're blurting out what you have to say. So does anyone know the synonym for- oh- I guess you're right, Jack.

Jack: RADTASTICAL *:D*
by bleyw&trippy January 8, 2010
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Fantastically Rad.

To exhibit behavior, actions, or state of being in a nature that intertwines traits that would be considered 'fantastical' and 'rad' simultaneously.
The artist's imaginative creations made under the influence of psychedelics were so astonishingly mind blowing, they could only b described as radtastical.

The steam punk space skate opera combined the art of gnarly grinds and other various rad skating techniques with a fantastical atmosphere, compelling story, and an epic sound track; in a way thats won the hearts of the critics as they describe it as "A radtastical ride!"

Fantasy Man, from Noel Fielding's Luxury Comedy, is the most Radtastical fictional Character ever conceived.
by SilverHammer27 August 2, 2015
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a word derived from the words "RAD"(commonly all capitalized) and "fantastic", in a way of saying better then RAD or Fantastic but in the sense of being rad or fantastic
RADtastic mainly used in small towns or areas made up in the city of Bellevue Nebraska while describing SKA music
a commonly used phrase with RADtastic is
"RADtastically SKAwesome"
"Dude, thats RADtastic!"
"RADtastically SKAwesome
by RADtastically SKAwesome January 11, 2007
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