Thread:Muppetfan/@comment-61.62.36.216-20120427015704/@comment-1487626-20120428123657

Aunt Betsy is just a random name that Mr. Haney (the principal) used. It's basically the same type of thing like:

"What on earth is going on here?"

"What in the world is going on here?"

A phrase "What in _____" can be replaced with tons of things and still mean the same thing. Another common one to use when using a name would be "What in the name of Aunt Betsy is going on here?"