What does it mean when your feces is a little bit dark?

Possibly...: Possibly nothing, unless it is very dark and tarry or maroon (due to the abnormal presence of blood). Normal color is light to dark brown, changing depending on bacteria in gut, diet, or any number of other reasons. The brown color of feces is due to the action of bacteria on bilirubin (a product leaked from dead red blood cells--which is normal).