b.o.

1. back order.
2. box office.
3. branch office.
4. broker’s order.
5. buyer’s option.

1. Board of Ordnance.
2. Informal. body odor.
3. Theater. box office.

abbreviation for

1. back order
2. branch office
3. broker’s order
4. buyer’s option

n.

abbreviation of body odor, by c.1950; an advertisers’ invention.