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3.
Short form for "or best offer." Usually used in adds to let people know that the price of whatever they are selling is open to negotiation, and that they will accept the best offer if the asking price is not met.
I am selling a TV for $50 O.B.O.
by buy/sell/trademe June 07, 2010
 
1.
obo
Or best offer

Use in forum classfieds sections.
The chastidy belt is $30 obo.
by eulerfx April 03, 2004
 
2.
OBO
OBO means 'Or best offer' mainly used in classifieds, or websites such as craigslist.
craigslist posting: 'Selling Laptop for $400 OBO'
by melonmonkey889 April 14, 2011
 
4.
OBO
Adj. An abbreviation of the classifieds/sales term "Or best offer". Used in the context of describing a man or woman who will take whatever he/she can get in the way of romantic companionship.
Melissa? She's a drunk with a lot of mileage on her. She's truly OBO.

Adam has slept with all of his friends' ex-girlfriends and now he's been hanging around that creepy, snaggletoothed, bettie page impersonator's house. Isn't she almost 50? Officially OBO.
by VRB February 28, 2007
 
5.
Obo
òbò (pronounced ob-oh)- 1. In Yoruba Language (West African)- Means the female reproductive organ/ Vagina.

2. Could be used to refer to a female.

1. Her obo smells bad

2. That obo is fine
Meaning: That girl is fine
by Olumide April 16, 2008
 
6.
OBO
On Behalf Of.
Representing o=communication on behalf of another 3rd party orginasition or body.
In written conmmunication: i.e. formal letter etc.

Signed: James Whistle. OBO Musical supplies Inc
by Jim Le Gros August 19, 2005
 
7.
obo
1. opposite of a boner.
2. Non-erect penis
Father ray had an obo when he saw the ugly girl.
by uncle rub and shag nasty July 16, 2008