BSO

Astronomy, Natural sciences Obsolete Blue stellar object: a radio-quiet quasar.

Education British school overseas.

Cycling, Hobbies, Lifestyle, Sports Abbreviation, Derogatory, Initialism, Slang Initialism of bicycle-shaped object, used to refer to cheaply-made, low-quality bicycles.

bright shiny object

Medicine, Sciences Abbreviation, Initialism Initialism of bilateral salpingo-oophorectomy.