When used in a business context.
noun: Churn is used when referring to 'churn rate'. Churn rate or churn, is the percentage of people that stop using or subscribing to a service within a certain time frame. For a business to be profitable, its growth rate must exceed its churn. As well as customer churn, there is revenue churn.
verb: These customers that have left have 'churned'.
Calculating churn can be simple. To find the percentage of customers that have churned, take the number of customers you have lost during a time frame, for example a month, and divide it by the number of customers you had at the beginning of that month.
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that bitch at the corner store got so many churn runnin round
by Billy Joe from Bama April 6, 2006
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hey look at that bruh bruh over there with his 24 karat shoes. HE HELLA CHURN!
by CHURN D July 11, 2008
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to smoke marijuana with another individual
Yo u trying to churn right after work?-Joe

Yeh no doubt hit me up-Clive
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The word of mouth crap that bubbles up in professional environments, some of which can be quite valuable, after sifted through, though typically ridiculed and scoffed at by everyone for its uncertainty.
Example of some churn: "Well, I have not talked to Rick, but Julie asked him when you were coming on board, and he said he would hire you as soon as we were sure that the new CEO will mean bringing in the business we expect."
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Cumming in someone’s ass, usually another dude’s, pulling out, then other guys plug in and screw the cum recipient hard. This has the effect of churning the first load of cum into a frothy meringue and so it does on. The same way people used to churn to make butter in the old days. Churning the love butter in someone’s ass-churn.
Steve and the guys gave Dave a right churning last night. Looked like whipped cream leaking from his ass by the end.
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The act of using bank account or credit card sign up bonuses to make money.
Ive been churning out some serious cash using credits cards.
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