Drinking buttermilk, denotes sorrow will follow some worldly pleasure, and some imprudence will impair the general health of the dreamer.
To give it away, or feed it to pigs, is bad still.
To dream that you are drinking buttermilk made into oyster soup, denotes that you will be called on to do some very repulsive thing, and ill luck will confront you. There are quarrels brewing and friendships threatened.
If you awaken while you are drinking it, by discreet maneuvering you may effect a pleasant understanding of disagreements. ... Ten Thousand Dream Interpretation