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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Meaning to give dick out; to fuck from a male prospective. Usually used as in to bone a chick.
Yo, bro! I churned the fuck out of that chick last night!
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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
by todle September 11, 2011
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Continue to stroke in and out of the vagina, rectum or mouth, after an ejaculation.
He continued to churn long after he shot his load into her.
by Churnking April 1, 2012
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Hand job complete with release. Either self inflicted or performed for you by a willing dairymaid.
After seeing her spread in Playboy, I spent the night churning butter.
by Dr. Johnson January 13, 2004
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