| Acronym | Definition |
|---|
| SMTH➣Something (IRC slang) |
| SMTH➣Smooth |
| SMTH➣Sumitomo Mitsui Trust Holdings, Inc. (Japan) |
| SMTH➣Shui Mu Tsing Hua (bulletin board system) |
| SMTH➣Signalling Maintenance Testing Handbook (railway) |
| SMTH➣Shui Mu Tsinghua (Beijing university) |