This is the 9658th most frequent German word.
münchner
A person or thing from Munich, Germany.
Here, 'Münchner' acts as an adjective denoting a product associated with Munich (as Münchner means 'of/from Munich').
Ich habe einen Münchner Apfelstrudel im Café probiert.
I tried a Münchner apple strudel at the café.
In this sentence, 'Münchner' is used as a noun referring to a person from Munich.
Der berühmte Schauspieler war ein Münchner.
The famous actor was a Münchner.
Here, 'Münchner' as an adjective describes the festival, indicating it is related to or occurring in Munich.