Does this mean what it sounds like?
Back in the 50s, my grandfather's brother brought a girl home to meet their family. My grandfather's family was really poor, but they broke out the nice china for her, including saucers. They said she was really pretty and my great uncle was all polished up in his Marine uniform.
Then the lady in question dumped all of her coffee in the saucer, pulled her chair back, leaned her face into her saucer, which was still on the table, and proceeded to slurp up her coffee. My poor great uncle was mortified and my family still make fun of this woman all these years later. She wasn't invited back. But that sounds like it could be saucering to me.
As a side note, my grandmother said one of her sisters married a guy whose family all drank coffee out of the saucer, which her family regarded as mildly eccentric, but they apparently had better manners than the other lady and made less of a spectacle while doing so.