second person general possessional pronoun; origin probably from following analogy: my is to mine, as your is to yourn

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

The scrabble cheaters version of "yours". Say you don't have the proper letters to spell "yours" but you happen to have an "n" and that triple word square is just begging to be won. You take this opportunity to throw caution into the wind and make up a word. Congratulations. Cheater.

A quicker and more convenient (lazy) way of saying "yours"