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1.
root word radonk, something so ridiculous and unbelievable that a word outside the standard lexicon must represent it. Something as ridiculous as the word "radonkulus" sounds rolling off the tip of your tongue.
Dubya is radonkulus.
by l. cohen, k.smith May 20, 2007
 
2.
When something is beyond ridiculus.
This is really Radonkulus.
by Lucky Ryan March 21, 2006