What is consonant Gangbang?

When words seem to consist of more consonants than vowels and are extremely long and complicated, e.g. in German language

"Donaudampfschifffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft is really a consonant Gangbang, don't you think?" (German for Danube shipping electricity main operations facility construction administrator's society)

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consonant Gangbang - video