The meaning of "Cool" at our house

Two year old Benjamin (formerly known as "Baby Ben") loves any kind of construction vehicles -- tractors, bulldozers, etc.

He calls them "cool." I don't mean that he thinks they are cool. I mean, he thinks they are called "Cool." Cool, in this case, is a noun.

What's funny is that now our family calls them "Cool." We went to the library and Rebecca got a video about fire trucks and said, "Look, Mom, I got cool for Ben!"

Or when we drive past construction, one of us will say, "Look, Ben, there's a Cool!"

He'll hand me the TV remote and say, "Cool!" when he wants to watch the video "There Goes a Bulldozer."