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A c-stopper is the plug that fills and seals the cervical canal during pregnancy. It is formed by a small amount of cervical mucus, and can be sort of bloody.

An alternative word for those pregnant ladies who can't stand the idea of using the terms 'mucus plug' or 'bloody show' in reference to it.
"Eewwwee! I think I just popped by c-stopper! Looks like this baby might be on its way!"
by marsumama August 20, 2009
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