I've done my best to decode it, but I've come up with nonsense.
In classified ads, OBO is "Or best offer". Out-of-body experience? Our best experience? Our best education? Our Best Equine might fit my horse farm, but would not be universal... Outrageous Bisexual Experience? It just doesn't have the ring of truth to it... Obnoxious Belittling Embarrassment? Everyone has had many of THOSE...