BOB

Etymology 1
Acronym of, fortuitously spelling out the male given name in the case of the humorous colloquial definition.

Noun

 * 1)  Vibrator (device designed to stimulate a woman's genitals).

Etymology 2
Acronym of.

Adjective

 * 1)  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.