Ball Python making weird noises (not hissing)

I have only had my ball for several months and he's about 2 years old. Several times he has made VERY loud noises. I'm not sure how to describe them - kinda like a cat coughing up a fur ball that lasts for maybe a minute. He stands up, twists his body up, opens his mouth, and contracts his muscles and makes these weird noises. He has no bubbles, wheezing, or mucus so I don't think it's RI. I also thought it might have been gas but he doesn't go to the bathroom when he makes the noises. His cage, humidity, hides, water, temps, and everything else are all perfect. I am a new snake owner and am very concerned. He has also become very aggressive with me, maybe they're related? Please help! And knowledge/encouragement welcome

Have you asked his prior owner about the behavior? And it's probably a lot to ask but a video would help.

To be honest it sounds like he was getting ready to poop or fart. :rofl:

Not all that many people get to see it which is why it isn't talked about much. Think of it as straining if it helps.

Haaaaaammmbone!!

Mine just did the same thing this evening. A loud retching sound. Never seen it before. Is yours still okay?