Okay so I didn't finish the last post before I published it so here is the rest of the story.
I decided I couldn't deal with him while driving the car so after we got home I put Justin down for a nap and then tired to talk to him about it. He insisted that his karate teacher had to told him that that was a type of kick and told him that was the name of it. I forgot to mention it to his mom when she got home so the next morning I told her to go ask her son what his feet were for. He gave her the same answer. She came out room and looked at me. I told that he said his karate teacher taught him that. She responded "Well if that is the only bad thing that comes out of karate.(NOT)
She went back to him and asked him again what his feet were for he replied "AXE Kicking" I don't know why you guys keep asking me that. It's a type of kick in karate.
It is safe to ride in the car with him. Please don't keep your kids away. He really is a pretty cool kid, even if you din't always understand what he is saying.