Gasstreak
Gasstreak, (or gastrique) those annoying lines in your underwear; (often referred to as {sharts}). When you think your flatulence is going to be safe from the active passing of poo particles, but upon examination you discover the opposite. Resulting actions include disposal of your underwear, a quick shower, fresh clothes or any combination of the above. Can result in mudbutt.
I was crop dusting aisle 5 in the local superstore when I was overtaken by a obnoxious smell. I soon discovered I had gasstreak