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Denisedds (88)
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By contraction of the rectum muscles.This contraction is enhanced by induced tenesmus by a voluntary action when there is need to defecate.
The colon (large intestine) is a muscle it contracts in such a way that it moves along the intestine until the end. Then the sphincter has to be opened and out it comes.
By peristalsis, that is a muscular contractions of the longitudinal and circular muscle of the large intestine that pushes the faecal matter along and the sphincter muscle at anus voluntarily relaxes to pass out the matter to the exterior of the body.
Hope that helps.
The large intestine moves it by peristalsis. Here is more information about it:
http://en.wikipedia.org/wiki/Defecation