1 As time goes on, the child is less and less able to hold the stool in-more and more stool leaks, and eventually the child passes entire bowel movements into his or her underwear.  Often the child is not aware that he or she has passed a bowel movement.
n. 1. (Textiles). a. a cotton fabric treated with oil and pigment to make it waterproof. b. (as modifier): an oilskin hat. 2. (Clothing & Fashion) (often plural) a protective outer garment of this fabric.
The oilskins had a peculiarly thick flavour of their own which made a sort of background to the smells of fried fish, burnt grease, paint, pepper, and stale tobacco; but these, again, were all hooped together by one encircling smell of ship and salt water.