fully radical;rad and fantastic at the point of full expression at the same time.
That show last night was fucking radtastic, dude!!
by Andy-Fuckin-V!!!! February 25, 2012
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it's when your SO rad, even ur testicals feel rad
yo, my white niggas, that shoot out was so radtastical testical that i almost shot my testical
by laninna July 9, 2007
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when someone shares fantastic news with you that's absolutely rad
aw dude that's radtastic
by kac-jesus-how October 23, 2018
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Your skateboard is way more radtastic! than my skateboard, duuude.
by Nick Kname November 7, 2014
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Totally cool, yet better then life.

Related to the words rad and awesome.
"That shirt is radtastic man."
by AudreyDoodleBop July 31, 2009
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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
by FabulousTurtle September 12, 2016
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