churning the butter 

The act of frenetically penetrating an already filled orifice until the semen within starts to resemble churned butter. Popular within the gay bareback scene.

After already receiving a thick load from one guy, the next guy started churning the butter with his juiced up cock.

churning the butter by Dirty-Boy August 3, 2007

churn (or) churning butter 

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.

churn (or) churning butter by Dr. Johnson January 12, 2004

Churning while burning 

Multiple partners performing a merry go round on a female while at the same time rotating and smoking a blunt.

We penetrated her as we were churning while burning.

Churning while burning by The Messenger July 6, 2015

churning butter

The result of walking after one has not defecated completely. This is usually due to constipation where the poop breaks in half, and one could wipe all day and still not be completely clean.

“My poop broke off before I went mountain climbing, so I was churning butter all day long.

churning butter by tenesmus September 11, 2016

Churrin 

Children, used for people who slur things together

Hey ya'll churrin get back in here.

Churrin by kyle January 15, 2004

Churning Up Pollution 

Having horrible coughing fits and spitting up a lot, thus contaminating whatever is in the way.

He was churning up a lot of pollution so I moved back a few yards.

Churning Up Pollution by The Midwestrn Soldier February 14, 2005

Churning Butter

When a man ejaculates within a woman's cooch and proceeds to continue humping away even though she is filled with his population porridge. The rod/thrusting action is very similar to how the people (in the days of yore) churned butter.
The fact that spooge is white and creamy, similar to cream prior to it being churned into butter, just adds to the greatness of this term.

After busting a nut inside her, I was churning butter for about 4 minutes until I started going limp.

Churning Butter by William W. March 13, 2007