High intensity sexual intercourse for an extended period of time that has the same health benefits as cardiovascular exercise
Mike and Amy stayed home to cardiofuck on the kitchen table for 2 hours instead of going to the gym to exercise
1 more definition
The process of opening a person's chest in some way (examples: Knife, axe, saw, etc.) and then removing their heart through a process of your choosing (example: Cutting it out, Tearing it out, Pulling it out, Chewing it out.) and then proceeding to have sex with the heart, preferrably using the holes in the atrium or ventricles. This can be performed on a living or dead person or other subject that has a heart, including animals.
"The Mortician was sent to prision for cardiofucking over 100 of his female cadavers."