lie feet uppermost:

To have sexual-intercourse , said of a woman . See copulation for synonyms.
See Also: all diked out, barkers, Big feet, big meat, cable laying, cap-a-pie, dogs, give someone the once-over, hoofs, ilium, pedal extremities, plates of meat, play footsy, play footsy-wootsy, plonkers, pups, socksy, trotters

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