This act is when you stand behind someone who is sitting while cupping your testicles. As you move along side this sitting person you say "Eric" and drop your testicles and say "Verdonk" as they make contact with the shoulder of the sitting person.
This was a well known
party trick of the late
New Zealand Olympian Eric Verdonk, and is classed as a formal greeting in
New Zealand, often referred to as the "white man's Hongi"