Super cow

We went to Chick-Fil-A tonight and they had a "paint your own cow" station set up. Charlie painted her "super duper cow" but it wasn't dry by the time we needed to go. So, I put it in a plastic baggy generously provided by the restaurant.
Later in the car, he was very mad at me. "Mama, what did you DO to my cow?!" he shrieked at me. "Now he's not super duper" he moped. "He's super loser. You made my cow a super loser."

WHERE did he hear that? He has continued to go on at me about how now his cow is a super loser, and it's all my fault.