My SIL says that all the time. I used to make fun of her behind her back about it (I know - that's mean). BUT, now I catch myself doing it. Talk about pay back. How's that for an emoticon - no irony there.
I say "yummy" on a daily basis....but I also have a 5 year old and a 1 year old so I find myself saying all sorts of immature jargon: stinkies, diapee, paci, boo boo.....It got a little out of hand once when I asked my husband if he "was hungee for some good food." He gave me the strangest look and said I needed some "adult" time.