What does it mean if your stool looks greasy?

Incomplete digestion: Aside from dietary extreems, this represents a serious problem in your intestines. Please check in with your doc.

Fat malabsorption: Greasy stools, unless taking mineral oil, generally means poor digestion of fats. Can be seen with pancreatic problems, and/or small intestinal problems like celiac sprue, parasitic illnesses like giardia, other GI problems. Needs to be seen and evaluated. See your doc.

Greasy stool?: Are you seeing oily stools with floating oil droplets (which implies fat maldigestion from use of dietary fat blockers, pancreatic and/or biliary disease, small bowel malabsorption, or excessive dietary fat intake) or mucusy stool (due to a range of conditions from inflammatory, infectious, ischemic, or "functional" due to rectal dysfunction, colon delay, or irritable bowel syndrome)? Need tests.