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.
by Holly. October 7, 2007
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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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