from Wiktionary, Creative Commons Attribution/Share-Alike License
- Boliviano, the currency used in Bolivia.
- Battery-operated boyfriend, that is, a vibrator.
- Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher.
Acronym, fortuitously spelling out the male given name Bob in the case of the humorous colloquial definition. (Wiktionary)