Definition from Wiktionary, the free dictionary
Usage notes 
This is the currency code used in the ISO 4217 standard.
- (humorous) Battery-operated boyfriend, that is, a vibrator.
- (philately) 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.