Don't be shocked by the Amish's knowledge of slang and the outside world
I live in Ohio, and if you have ever been to any of the Amish areas you know that they are big for the tourist industry.
Many of the Amish kids work side by side other kids in the shops, hotels and other businesses in these towns. So they hear and see the trends of the outside world probably allot more that you think.
I was surprised how willing they were to take off their clothes. I would have thought they would be more conservative in their dress and such.