Withering disapproval for the statement or action of another. The term originates in New Zealand and became well used in the mid 1990's when Eric Verdonk, an olympic rower was in prominence.
(When someone tells a lame joke) "Ohh... verdonk"
by Zippy from Rainbow January 29, 2006
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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"
Verdonking used as a greeting

"Eric (drops testicles) Verdonk."

"Hey mate, long time no see."
by The Mayor of Newlands November 29, 2021
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