A stinky, unclean butt, left to ferment in a computer chair for hours while playing World of Warcraft. Usually the person is highly addicted to WoW, and therefore doesn't take the time to properly wipe after defecating because they are in too much of a hurry to get back to the game. The result is a butt crack which is still smeared with fecal matter, which is then sat on for long periods of time. This allows the shit bacteria to ferment and marinate creating an unmistakable odor.

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