Peristalsis is the natural wave of your body's different systems moving in a wave like motion to ensure that food makes it from jaw, to stomach to anus with no hiccups, thusly helping you to poop when you got to instead of holding/storing/delaying the process, causing problems in the line of command.
Everytime you feel yourself gathering this second wind shytting, you talking about.
Haven't read all the comments in here yet, but Gut Microbes and Gut health might help a bit too, but I'm sure someone more learned on that can speak on it. I just eat Yogurt or steal Kombucha drinks whenever I feel like my gut ain't working right.