I did a google search on "Hell's box office" and came up with 201 entries. Excluding the word "Pelosi", it narrowed down to 136.
It doesn't seem to be a very common phrase, but apparently it is used by some evangelicals, whom Pelosi must have run into during her filming.
"It doesn't seem to be a very common phrase,"
I live in the bible belt and I am an Evangelical. I have NEVER heard the phrase. I did hear it called Hell Burning Over once about 20 years ago.