A raunchy sexual position where the woman is nearly upside down with all her body weight on her upper back and neck, legs straight up in the air. The male takes his position above her, pushing his cock straight down into the woman's anus and uses his legs to thrust, thus creating an action similar to pushing the plunger down on a french press coffee maker. Basically the anal version of the piledriver, a vaginal entry position. It can only be classified as a french press if the man ejaculates inside the woman after much "plunging" thus creating a burst of hot liquid - not coffee either, mind you.
The look on her face was priceless as I seamlessy transitioned from a piledriver to a french press.