What does it mean when you fart really loud?

Loud flatus – this is caused by the muscles of the bowel forcing air through the tight ring of muscle at the anus. Suggestions include passing the air with less power, and reducing the amount of intestinal gas by making dietary adjustments.

How do you silence a fart?

0:291:41How to Fart Quietly? How to Fart Silently? - YouTubeYouTube

How do you fart longer?

Just like you swallow air to make yourself burp, similarly by letting air in and out of your ass can make you fart easily. For this lie down on flat ground and pull your legs towards your head. Now relax your rectum and let the air seep in slowly. Keep at it until you feel bloated and a butt bomb bubble up.