look up any word, like trill:
 
1.
ONB
Abb. for Orange is the New Black.

Because its shorter and easier.
Let's watch a ONB.
by Checmix78 September 03, 2013
 
2.
ONB
(n.) Other Niggas Bitches

A Bitch whom is in a committed relationship with another Nigga yet not exclusively. Often referred to as any bitch in a relationship ever if you have pimp juice.
Tom doesn't like to buy bitches things or hear about their stupid problems so he only rolls with ONB's. Tom is a real Mac.
by Association of Players & Pimps September 04, 2011
 
3.
onb
simply means "one night blow" =]
see that guy over there, he was an onb.
by sexyjbl June 08, 2009