To Make Noise
To Be Boisterous, To Make A Fuss
The kanji is boisterous. The verb version is to make noise or to be boisterous. Basically, you're being boisterous when you make a lot of noise, so that's where it comes from.
さわぐ
When you go to make noise and be boisterous, you go to the local 沢 (さわ) swamp. It's an awesome place, and people don't complain about the noise.
騒ぐな！死にたいのか？死にたくなけりゃ黙ってろ。
Don’t make so much noise! Do you wanna be killed? If not, just shut up.