"Baot-is" is a silly way of saying the norwegian word "båt-is". "Baot-is" was discovered when a more or less unknown dialect used it instead of the originial "båt-is". Båt/baot-is is an ice-cream shaped as a boat. In scandinavia there is an unofficial battle of who has the best boat-shaped icecream.
"Hey, I'm gonna buy a baot-is!"
"Sweden has much better baot-is than Norway!"