Radtastic 

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!!

Radtastic by Cindell Corbeil December 20, 2007

RADtastic 

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

RADtastic by RADtastically SKAwesome December 10, 2008

Radtastic 

Extremely rad.
Really "cool".
Amazing.

Sarah is radtasic.
Ashley, that stunt was so "rad". Radtastic
Tonight is going to be so radtsatic.
Tonight is going to be so rad.

Radtastic by Holly. October 23, 2007

radtastic 

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

That show last night was fucking radtastic, dude!!

radtastic by Andy-Fuckin-V!!!! May 11, 2012

Radtastic 

Totally cool, yet better then life.

Related to the words rad and awesome.

"That shirt is radtastic man."

Radtastic by AudreyDoodleBop July 31, 2009

Radtastic 

An adjective to describe something both radical and fantastic; a portmanteau of the two words

John: hey how'd you do on the quiz

Jake: fuckin radtastic

Radtastic by FabulousTurtle September 12, 2016

radtastic 

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

aw dude that's radtastic

radtastic by kac-jesus-how October 22, 2018