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Wiktionary
smth

abbr. (context internet slang English) something

Wikipedia
SMTH

SMTH may refer to:

  • Tsinghua University, a university located in Beijing with specialism in engineering disciplines
  • SMTH BBS, an influential bulletin board system in China hosted by Tsinghua University
  • SMTH, a term used in British railway signal engineering referring to the Signal Maintenance Testing Handbook, a document maintained by Network Rail
  • something, an Internet slang term which originated on Bulletin Board Systems