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 June 8, 2007
Get the Radonkulusmug. by Lucky Ryan April 5, 2006
Get the Radonkulusmug.