"I wanna go where there's a restroom show"

The story:

When I first heard the song I hadn't the faintest clue what that line
was supposed to mean. I didn't know the real words at the time.
Once, I played the CD it's from and sang while my sister listened.
When it was done she said, "a RESTROOM show?" (She knows about
my propensity for bathroom humor.) And I said I didn't know what
else. And then I was with a bunch of my friends and I sang the
song really loud. And we were around a bunch of other people, so
they heard me. And then when I got home I checked the words.
And then I knew.