At their site, you can enter words that you have made up. I had made up a word for my girls regarding a certain type clothing, so I entered it into the online dictionary. Check it out!
http://www3.merriam-webster.com/opendictionary/newword_display_recent.php?id=3002
You could, probably, put your entry in for radical dubs!
I just realized that radical dubs was redundant.