RhymeZone: bso definitions

Definitions of BSO:

noun: (astronomy, obsolete) Blue stellar object: a radio-quiet quasar.
noun: (education) British school overseas.
noun: (cycling, slang, derogatory) An abbreviation of Bike-Shaped Object, used to refer to cheaply-made, low-quality bicycles.
noun: bright shiny object

(Definitions from Wiktionary)