I’d like to know what is causing this subcutaneous movement.
It’s safe for work, non-sexual, non-violent but it may make you uncomfortable.
What part of the body is that, even? (Is it actually part of the body?)
It looks like it’s supposed to be an abdomen to me. I don’t think it’s real.
Not enough context to tell.
This is the stomach of a guy who’s apparently missing his abdominal muscles and what you’re watching is his intestines digesting a bowl of cereal - Corn Pops, actually! Want some?
More detailed videos:
In case you were wondering, from his comments in the second video:
And with context comes the answer. Man that’s freaky. I so have to use that when I teach the topic of digestion in a few weeks.
“Peristalsis… not for those with a weak stomach” is actually a pretty funny joke.
I’d have skipped the “LOL”, I’d have appreciated the delivery to be a bit more sly. Hanging a lampshade on it like that kinda ruins it.
Good gravy.
Huh? How can you tell just from the apparent motion through his intestines that it is good gravy?
Wow. I feel for that guy. Yet, I also kind of wish they could have closed him up with a piece of plexiglass instead of a layer of skin, so that you could really see what was going on in there.
Visible peristaltic waves are almost pathognomonic of intestinal obstruction.
This Google performed, this fact learned, this quote copied, this quote cited, this time spent, [del]this England[/del] because of this thread. Thank you to OP.
Slightly disturbing yet painless anecdote… In my twenties I had a hernia, an abnormal opening in my abdominal wall. It allowed a loop of my intestine to drop down into my scrotum. The first I knew that anything was wrong was when I noticed I had a ball bigger than my fist. And then it would shrink to normal size and the other side would swell. The swelling was apparently material moving through the intestine. It was painless but I could sometimes feel pressure as things moved around.
I went in for an operation, they put a mesh across the opening, and it hasn’t happened since.
So you’re not GardenofGandalph. [suitable for work]
If it were bad gravy, his intestines would be moving in the opposite direction.
Are we getting whooshed? “good gravy”, “holy cow” “will you look at that”, “oh my word”, “jesus H. Christ”, etc.???
J.
Not “we”, just you. 
I’ll say one thing- the guy has guts.