OIT

Jeffrey Steingarten, The Man Who Ate Everything (New York: Vintage Books, 1998), p. 231:

Why did they formulate Olestra this way? Because the early, more liquid versions caused gastrointestinal problems. One of these—"anal seepage," or, in my preference, "passive oil loss"—occurs when fully liquid Olestra separates from the food with which it was cooked and slips along the inner walls of people's intestines, bypassing everything else in its way. Drops of Olestra show up on their underwear or floating in their toilets. (The FDA actually abbreviates this as OIT, "oil in toilet.")