To bring a woman to climax with your hand by rubbing.

When you eat dirt for the first time and leave your family to build a shack in the woods

A reverse burp. A sound caused by the release of gas from the digestive tract, within the oesophagus. Unlike a burp, however the mouth remains closed and the action itself is involuntary. The word is derived from "burp" spelled in reverse.

A prub is basically just a burp, but in reverse. So its like inhaling a burp.