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A person who is so ignorant or stupid that he/she is clearly "Operating On Brain Stem Only" --OOBSO-- with no higher brain activity.
1. The clerk in any American store who does everything by rote and, if asked a question even slightly out of the expected, is totally unable to respond.
Clearly an OOBSO.

2. George W. Bush, OOBSO extraordinaire.

3. Loud mouth fools on talk radio, OOBSO paradise.

4. Sarah Palin, Brain Baked Alaskan OOBSO.
OOBSO by Diogenesparis April 14, 2009
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A typical no-clue idiot that you find everywhere you go.

Stands for "Operating On Brain Stem Only".
Clerks at fast food places who memorize their lines and who, if you ask anything out of the expected questions, are totally bewildered. What an OOBSO!
OOBSO by Atticus Madison September 10, 2005
Related Words

Obsolete Mule 

The nickname given by the Brilliant Matt Hardy to his OBSOLETE! Money making mule. Brother Nero.
Obsolete mule. You must learn to control your spot monkey addiction.
Obsolete Mule by Phoenixrana August 26, 2016
noun
A person who, in a display of misguided political correctness, points out insensitivity towards a group of which s/he is not a member, and which has not been offended.

O(utraged) O(n) B(ehalf) O(f)
A: Mike's upset about the ladies' bathroom signs, and wants them taken down. He says they're sexist.

B: What? Why?

A: Because the stick figure women are in skirts.

B: Wow, what an oobo.
oobo by Pokeymon September 1, 2009

Obsolete 

Cassette tapes are obsolete.
Obsolete by Rodney Basil May 23, 2004

planned obsolescence 

A process which involves a manufacture to develope a product (such as a car, video game console, TV) with the intentions of making it obsolete and/or non-functional after a certain period of time in order to sales and profit. It has benefits for a producer (repeat purchases) but disadvantages for the consumer(waste of time and money).
Man, I have to go to the store again; my toaster broke and it would cost more to fix it than to buy a new one. Freakin' planned obsolescence.
planned obsolescence by Yza January 11, 2009

obsolete farm equipment 

- " Is Jimmy in the bar? If he's there, his motorcycle will be parked out front."
- " I know, I can't tell, my view's blocked, all I can see is a bunch of obsolete farm equipment."