John: Hey Ted how was Susan last night?
Ted: Great she knew how to Churn Butter like a pro!
John: Lucky! I have to churn my own butter now that Kari left me.
While having intercourse with a woman, you stand up and pick her upside down while she performs fellatio, as she is doing so you thrust her up and down in the manner of churning butter.
During a gay orgy, multiple tops will cum in the ass of a bottom until he can't pack any
more in and then a final top (usually with biggest penis of the group) will forcibly pound all the semen deeper inside his rectum. Like a butter churn. *squish* *squish*