I was bored and entered “sdmb” into Google to see what would come up. Some of these are cool, funny, or just weird:
Sonoran Desert Mountain Bicyclists
SanDisk 32 MB MultiMedia Card (model number SDMB-32-470)
Statistics and Data Management Branch
SomeDay/MayBe (as in, things you’d like to do)
Sovereign Debt Management Blueprint
Sun Devil Marching Band