I've been seeing this thing for years and I'm sure it's a joke I'm missing... but what the hell is it? What does it MEAN? What is the story behind it? What does the description ("Bt ts bk ws impant.") meeeean??

The Book Without a Middle, if I had to guess. Since all the words are missing their middles. :)

Oh and the description is "but this book was important" I think.

Ohhh. O.o I assumed it was "The Book Without" but didn't get "Mile/Middle" even though guuh, it makes sense now.

Well thanks and also happy birthday!

I think the description is supposed to be "I bet this book was important," or "Bet this book was important."

It probably is "bet."

And, Jeez, I JUST realized the damn thing is actually missing its middle. Like, the book itself. A square of middle cut out.

Guuuuuuh.