What does the term "cowbell" mean?

Question

Like when some says: "needing more cowbell."

What does that mean? Is it a drug or something? I'm obviously out of the loop.

Answer 1

Seriously? Best of Will Ferrell. SNL. It's simple someone just wants more cowbell in a rock song, But we do need more cowbell. Please, we do need more cowbell. That's whats wrong with America, we just need more cowbell. I got a fever...................