Clamor
Uproar, Big Noise
noun, verbal noun
If 騒ぐ is "to make noise," then a big version of this is even louder. It's a clamor and an uproar.
This is word that uses the kun'yomi readings of the kanji, which you should know already because 大 is pretty familiar to you by now (I hope) and you just learned 騒ぐ as well! Put them together, with a little tweaking at the end, and you have your reading. Ta-da!
どこかの国で、ゴリラが逃げ出して大騒ぎになっていたことがあったよね。
An escaped gorilla caused a major scene in some country, didn't it?