Anyone speak baby Apache?

So, we decided that our son does NOT speak English. He inadvertantly picked up on another language while growing up his first two years in Arizona. The problem is... we can't understand him. We are baffled at his diverse dialect. "Teen-Teen" is the latest frustration, as we cannot figure out what he's saying as he points out the car window and reapeats "Teen-Teen" over and over like a broken record. Anyone know what "Teen-Teen" might be? There is a free Matchbox car in it for you if you can decipher the infamous "Teen-Teen" meaning (we will even let you choose from our latest assortment). We are crazy with bewilderment and confusion of "Teen-Teen"--I just had to say it once more to prove how annoying it is not to know the translation. However, I DO love to brag about my two-year-old son speaking Apache... regardless of the exaggeration.