Hubba, Hubba

While walking down the street with Claire the other day we saw a cool car go by and this was our conversation:

Claire: Mom, look at that cool car. Hubba, hubba.
Me: Claire "hubba, hubba" is not the best thing to say. Some people use that expression when they see a pretty woman.
Claire: Then you're a hubba, hubba.
Me: (laughing uncontrollably as I try to explain the definition of deragatory)