A friend of mine once said that if you keep your lips puckered up, and force yourself to breathe through a tiny hole, you increase the air pressure in your mout

A friend of mine once said that if you keep your lips puckered up, and force yourself to breathe through a tiny hole, you increase the air pressure in your mouth and lungs, which is useful at a high altitude. I don't have a thought at this moment how to test this as I sit hear at sea level. Any idea if this is true, or partially true? I didn't see anything about this in a quick Google search.