Thin layer of poop molecules enveloping a fart. Sometimes trapped by undergarment fabric and creating "skidmarks", but often escaping to clutter the environment.
"Lee you need to air this place out, the fartskins must be about a foot deep in here!"
by skintlizerd August 26, 2008
The thin envelope of cells surrounding a fart.
This room stinks and the fartskins must be ankle deep!
by Skintlizerd November 26, 2008