I know 5 years ago I posted this with the Boy (http://daddyimstinky.blogspot.com/2008/07/aww-nuts-turn-off-tv-dad.html), but the Girl has taken up this saying.
Often times while doing something you will hear her exclaim "Aww NUTS!" I wonder what they think at school about this. I guess it is better than other things that could come out of an adult's mouth.
I am sure our laughing when she says it doesn't help her being upset about whatever just happened but it is hard not to crack a smile when she exclaims it.