This word is best used when you complete a task you had set out to do, describing that task, or the way you completed that task, as "Dusseldorf."
However, this word can be used in place for any simple word.
As a noun: "Johnny got a Dusseldorf on his test, and aced the class."
As a verb: "Yo Tony, Dusseldorf me that pencil."
As an adverb: "I Dusseldorfingly hit a hole-in-one"