A sex act popular in certain fetish circles.
It involves a man cumming inside the asshole of a partner. He then eats out the asshole to get the "turnip seed" (cum). Turnip farming requires that the asshole cannot be cleaned out beforehand (there must be "soil" present). There is some disagreement in the community as to how much soil should be present. While some members enjoy nothing more than a dirty asshole, more hardcore fetishists may take more extreme measures (e.g. drugs, restricting bowel movements, etc.) in order to increase the amount of soil present.
Bob regularly engages in turnip farming. Yesterday, he came in Sally's asshole and farmed his turnips.
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