To be Incredibly amazing, both RADical and fanTASTIC at the same time.

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"

Extremely rad.
Really "cool".
Amazing.

fully radical;rad and fantastic at the point of full expression at the same time.

when someone shares fantastic news with you that's absolutely rad

Totally cool, yet better then life.

Related to the words rad and awesome.

a combination between radical and fantastic,