All of these are words that Nathanael says, that really don't sound quite like the intended word. Most of the time, it's hard to understand. But, other times, quite clear.
Take nee-nee for example. We were at a fabric store, and another customer was talking to Nathanael while we were waiting in line. He kept touching my shoulder and saying Mama. I sat him on the counter, and while looking at the lady, he yet again introduced her to me:
"Mama" - pats shoulder.
"Nee-Nee" - pats breast.
(the secret word key for the above words: Oh no!, cup, chips, dog, plane, car, cat, chair, four wheeler, water, yogurt)