n. a smooth fucking session (not to be confused with the rough stuff in Brando's controversial butter scene in the Bertolucci film Last Tango in Paris)
As he and his wife grew older, he took consolation in the mellow rhythms of a butter fuck in their sleigh bed.
The art or act of taking a half of a stick of butter and inserting into the vaginal cavity and applying ones penis in a sharp thrusting motion where as the butter provides the lubrication for hateful sex.
Afterwards the said butter can be used to butter your roommate's toast.
Chef Piere growing tired of his assistants incessant bitching, took her to the walk-in for quick hard butter fucking... doggy style.