Posted in Business & Finance, Internet Slang, Organizations, Pop Culture, Science ZSM stands for; ZSM stands for Zo Spoedig Mogelijk ZSM stands for Zo Snel Mogelijk (Dutch: as soon as possible) ZSM stands for Zavod za Standardizacija I Metrologija ZSM stands for Zuider Stoomtramweg Maatschappij (Dutch: Southern Steam Tramway Preservation Society; public transport company)