Definition please...

I know this is supposed to be a "Wordless Wednesday" post, but I couldn't resist saying something. I learned something today. Imagine that... the teacher learning something! I think it happens every day whether I realize it or not. Today I was introduced to a new term. It's BHAG. Maybe some of you smart people out there actually know what it means, but I had never heard it before. Yes, it's very easy to find the definition on Google, but work with me here. Take a couple minutes to think of a definition. It's an acrostic, so here's an example. YMCA=Young Men's Christian Association.

What does BHAG mean? Yes, after you write a comment with your definition, you can look it up on Google. :)