There are several "Rachael Rayisms" (I think she coined the term herself), and we all have our favorite. Or should I say our least favorite of all the ones we don't like.
Mine used to be "EVOO," but that has become such a part of the everyday food lexicon that I consider it a real food term now and not just something that Ray says (in fact, I believe the Oxford Dictionary just added it?). I'm gonna go with "Delish," because it embodies everything that's silly about the worst cooking shows and just overall lameness. Plus she says it in that new Christmas Dunkin' Donuts commercial and it drives me nuts. Other phrases she uses: "You guys!," "Parmigiano Reggiano," "awesome," and the classic "Yum-O."
To get you in the mood, after the jump, 2 minutes and 46 seconds of Rachael Ray saying "mmmmmmm."