There are 3 main definitions of BO in English:

BO1

Syllabification: BO

abbreviation

1 informal Body odor.
1.1Best offer.
1.3Back order.
1.4 (also B/O or b/o) (In bookkeeping) brought over.

Definition of BO in:

There are 3 main definitions of BO in English:

bo2

Line breaks: bo

Entry from British & World English dictionary

exclamation

Another term for boo1.

Origin

late Middle English: imitative.

Definition of BO in:

There are 3 main definitions of BO in English:

bo3

Line breaks: bo

Entry from British & World English dictionary

noun

US informal
Used as a friendly form of address.

Origin

early 19th century: perhaps an abbreviated form of boy.

Definition of BO in: