Sexual technique. See the example.
From Six feet under (ep. 48):
(Jimmy and Claire in the bed, obviously after quite a good job..)
Jimmy: You know what is's called?
Claire: It has a name?
Jimmy: Grinding the Corn.
Claire: Grinding the Corn? What's the corn?
Jimmy: You know, with like a mortar and pestle. Only you push the pestle against the rim of mortar. Not in the bowl.
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