Help finding a book title
 

So, to make a long story short, I remember reading a book in elementary school (this would be in the early-mid 80s) with a bunch of (school?/camp?) kids cussing up a storm. Before I finished the book, the fat-ass after school lady (who was a bit evil) saw it and took it away from me. They removed it from our library forever. I know this is a vague description, but does anyone have an idea of what this might be? I remember some time ago reading the South Park guys were influenced by it, but of course I never wrote the title down...