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

OB

"Old Balls" usually used to make fun of someone because of their age, or on their birthday to make them feel old.

"Hey Ryan you have OB now that your 25"

by pobcat March 22, 2010

OB

Older Boy. similar to Older girl or Little boy. if you are a girl and you are going out with and older boy OB.

I think i am going to the party, there will be OBs.

Are you going out with an OB?

by pooismylife June 11, 2011

ob

short for obvious; also obvs, obv, awe, and ib

"you gunna nail that chick tonight"

"ob"

by greg bush June 14, 2008

OB

Open Beta

when will they announce the date for OB?

by FreeDrone August 25, 2013

Ob

(n) short for obligated sex/head. "ob" is a commonly used term to describe a girls obligation to pleasing her man. Furthermore, there are many more types of "ob". A few examples: Basic "ob" refers to simple kissing to some making out, moderate "ob" refers to hand job, advanced "ob" is a blow job, and r"ob"* refers to finishing the job.

*R"ob" does not imply stealing home--that is rape and rape is not looked highly upon in our society. Don't do it.

FUUUUUUU I've been stuck with welfare ob for weeks now!

by The "Boss" June 19, 2010

OB

This stands for Outlaw Biker. An Outlaw Biker is the type of guy the girl of your dreams goes and fucks because you're too much of a pussy to take control of your "relationship" with her. Most of the time he is either unemployed, has a substance abuse problem, or has callous "dating" habits. A combination is certainly possible, too. Commonly used to conjunction with "IW" or "intellectual whore" which is exactly what you are if your dream girl fucks OBs then cries to you about it.

Last night I told Jane that I loved her and I'd do anythng for her. She said "let's just be friends" then went home and fucked an OB she met at the bar. She called me up later to cry about it, and I listened to her because I'm a nice guy/IW.

by Cardinal November 26, 2007