kadoonka

The sound a turd makes when it hits the water. Usually followed by the splash back of water into the anus.

Naval officer 1 : "I think North Korea just tested another long range ballistic missile!"
Naval officer 2 : "Nah that was just Freddy dropping a kadoonka off the port bow."

Kadoonka

A dumbass person who is so stupid it is quite unexplainable.

My friend is a Kadoonka