1.) The moist "ass-crack" template left on plastic chairs after a fat or
generally sweaty person has been sat there for a good stint.
2.)When you've got a randomly itchy arse for no apparent reason and you need to go wipe it to sooth the urge, its normally "Cleft Oil" thats causing your problem, a mixture or fart and sweat and
whatever else might be in
your ass crack.