rad- short for radical, which meant cool, a term that is still used today by a populace of individuals that never really grew out of the 80's scene and still believe that other terms are cool such as "hey dude" or worse "dudette" and even "totally." Beware of these individuals for they are probably still sporting a Madonna or Micheal Jackson glove on one hand with the fingers cut out of it, watching movies such as Pretty in Pink or The Breakfast Club, and own a very colorful collection of wrist or ankle warmers.
Everyone laughed at her when Jane called Bob's new car rad.
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