When pinching a loaf (taking a bowel movement) and your turd drops, the resulting water splash hits you directly, dead center in your anus. This can be equated to a bulls eye when playing darts. The water droplet must be precisely dead center to constitute a "holes eye", a VERY EXTREMELY rare occurrence.
While taking my morning coffee dump, I experienced a holes eye.
The urine and feces filled water nailed him directly, dead center, in his anus resulting in a holes eye.
The chances of that that happening again are about as much as a holes eye.