You can’t jump out of your mouth. Or anyone elses

It’s extremely dangerous. You can evert your entire epithelium and wind up with all your internal organs outside.
There’s also the distension problem, which is even more uncomfortable for a Fatone than a Thinone.

Jumping out of your own mouth is about as successful as someone reading my own reply in this thread.

The key to jumping out of your own mouth is using your tongue as a sledge.

Apparently jumping out of your own mouth is rather successful.