esoR,
Here is some info on colonic inertia and pelvic floor dysfunction. It is actually both of the things you described, not traveling and having a hard time being expelled. Hope this helps, gogently
Colonic inertia: Colonic inertia is a condition in which the nerves and/or muscles of the colon do not work normally. As a result, the contents of the colon are not propelled through the colon normally. The cause of colonic inertia is unclear. In some cases, the muscles or nerves of the colon are diseased. Colonic inertia can also be the result of the chronic use of stimulant laxatives. In most cases, however, there is no clear cause.
Pelvic floor dysfunction: Pelvic floor dysfunction (also known as outlet obstruction or outlet delay) refers to a condition in which the muscles of the lower pelvis that surround the rectum (the pelvic floor muscles) do not work normally. These muscles are critical for defecation (bowel movement). It is not known why these muscles fail to work properly in some people, but they can make the passage of stools difficult even when everything else is normal.
This is a pretty good site for info
http://www.medicinenet.com/constipation/page2.htm