Urban Dictionary: Grinding the Corn
Term for a sexual technique. Picture the action of grinding corn with a mortar and pestle, but grinding along the rim instead of grinding in the bowl. A penis is the mortar and a vagina is the pestle, with her pubic bone (and clitoris) the rim. Heard in an episode of HBO's "Six Feet Under", Original Air Date, 15 August 2004 (Season 4, Episode 9).