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a person that is Definitely Rad; an association of Gnarly People; believers of the Rad Harmony Faith; People that are allergic to Lame; Epic Lame-Slayers from Slutty Utah; anyone Awesome;
"Priest Rev. Jonson, Kung-Boo, and the Slutty Martinez Brothers are Def-Radder Lame-Slayers, and the Fathers of Rad Harmony!"

"Def-Radder's do not, or ever will listen to any Usta-Groover"

"That Def-Radder is the Gnarliest Mother Effer I ever Met!"
by Don_Mayhem January 26, 2010
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