Fart Scratch
When your butt itches and you have a stored up fart, you violently squeeze the fart out in such a turbulent fashion that the itch was instantly eliminated, thus killing two birds with one stone.
It takes mastery to fart scratch in public without detection.
Fart Scratch
That feeling you get when you didnt wipe enough and your crack itches like crazy. When you finally wipe it feels amazing!
Damn dude I got a fart scratch its so itchy