OB

An abbreviation of old bill.

The damned OB came and broke up our party.

by amoe August 17, 2004

ob

another name for the police.

the OB came in and broke up the fight between the hooligans.

by International Bad Boy October 17, 2004

ob

A shortened version of "obvious" or "obviously."

are u going on a date tonight??
Ob!

by falcon1 December 9, 2008

OB

Abbreviation of "Open Beta" referring to a software that is open for evaluation; Blackbox-testing.

When will the OB start for that new mmorpg?

by Fraggleroc January 1, 2008

ob

Short for ; Over Board
Having or dealing with taking things to far!

Man that girl's outfit actually looked good until she went ob with those bright ass socks !

by Some girl who lives in Baltimo May 18, 2010

obs

open Bolt Semi, this is a type of gun that was ruled an illegal machine gun by the ATF in 1982. It was decided that they were to easy to convert to full-auto.

the obs kg-9, the predecessor to the closed bolt kg99 or tec9, was ruled an illegal machine gun.

by Alex Lindsay March 27, 2008

ob

Prefix meaning "obligatory". Most commonly used when saying something otherwise offtopic in places like Slashdot where that is frowned upon. Can be used where something is expected but might otherwise be missing.

Jessica Simpson is an airhead.
ObTopic: Linux is cool.

ObDrama: But she said she liked him instead.

ObLanguagePolice: There is no such word as "alot".

by fax4voice3 December 28, 2005