OB
Onion Booty. Used to describe a phat-ass bitch with a phat ass.

Reference www.onionbooty.com
Yo Greg, 10 o'clock your time. Check out OB on that one son ... Daaamn!
by James Werdsbond October 24, 2008

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OB
Open Beta
when will they announce the date for OB?
by FreeDrone August 23, 2013

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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 May 17, 2011

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Oatmeal Boy, referring to one whom consumes an unusual amount of oatmeal on a daily basis, especially in the mornings. This may result in him smelling like oatmeal throughout the day and may have negative effects on his ability to grow facial hair. In particular, he may not be able to grow facial hair on his cheeks.
Employee 1: What is that smell?

Employee 2: Oh thats just O.B., had his oatmeal this morning I guess.
Employee 1: What happened to his beard?
Employee 2: Must have fallen off since he is really putting away that oatmeal
by Gnome Guy 65 June 25, 2010

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The acronym for Obsessively Bitchin. When a person will not stop doing, saying or is just over the top.
That dude over their was O.B. last night with the beer
by granniebeater April 08, 2010

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Passsed the obsession with something
Shannon was totally O.B. with her Mercedes.
by Jimmy Dalts December 28, 2005

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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 01, 2005

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