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 daylong.
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.
Masturbation, man-style, with two hands. Must use an up and down, side to side flowing motion. Just like a grandma churning butter in a barrel in the late 1800's.
My girlfriend wanted some spread for her bread, so she had me cum over and started churning butter.