When a woman is pounded so often and so hard her pussy chatters as she walks.
Joe: I swear the boss has clam chatter.
Doug: Is that what I hear when she walks down the hall?
Joe: yeah, I think it's because Paul's been pounding that several times a day.
Doug: wow! That old man can still put it out.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).