English Etymology Initialism of standing (“erect”) but not operating. Adjective SBNO (slang) A roller coaster or other ride at an amusement park which is assembled, and not formally defunct, but not operational or open to the public. After 2 years of maintenance, the dark ride is still SBNO. Anagrams bosn, BSON, BNOs, obsn., nobs, BN(O)s, bos'n, bo's'n, snobWikiwand - on Seamless Wikipedia browsing. On steroids.