The act of having sexula intercourse while the girl is under a coffee table, and when the girl sticks out a leg or an arm the man smacks it with a whiffle ball bat untill it goes back under the table.
Usually reserved for jobs or activities that require hardhats. "Two turles fucking" is when a person takes off his/her hardhat and swiftly brings it down on top of another's hardhat still on other's head. It doesn't hurt like being cracked in the head, but it stings a bit and jars one's brain.