Definitions by Dr Heinrich Paradox

Doinker 

The word "Doinker" can be used as an expression of positive surprise or simply as an expression of happiness. It is usually used by the person being surprised, but can also be used by the person surprising the other person.

Other person: "Happy birthday"
You: "Doinker! Thank you very much."

Doinker by Dr Heinrich Paradox July 5, 2017