When someone becomes so excited by something that the energy contained inside the "ralper" manifests itself in the form of an awkward squeel of immense joy. An act illustrating the inability for one to maintain composure, causing a complete break of character, regardless of who may be nearby.
Joseph was watching an oh-so-entertaining episode of Kenan and Kel one evening and during an awkward moment of the show, he became so excited and embarrassed for the comedic duo that he let out a ralph. Nobody looked at him the same again.
Ralphing occurs regularly throughout society.
The two children skateboarding slid down the hill at lightning speeds. They managed to find a way to a complete stop. The thrill was so immense that they both jumped with joy and took turns ralphing.