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OSB stands for “on sweet baby”
Osb those were the best chicken tendies I’ve ever had!
by on gah July 29, 2018
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old sonny bastard, copyrighted by me - osb in the year of 1993 when i met my wife, the internet.
by osb January 24, 2004
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OSB, aka "One Sentient Being", is a term describing two or more people who "connect brainwaves". For example, this happens when they say, do, text, or think the same thing at the same time.
Person 1: I really hate this tweet.
Person 2: Whoa, I was gonna say that, osb!
by yeetyoongi January 24, 2019
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Oh Shit Bro or Oh Shit Brother or Oh Shit Boy or Oh Shit Bitch- This phrase can be used several ways and change meaning depending on the situation. It could be from some exciting event or a close call. Could also be used in place of OMG for those guys who are fed up with this phrase (too feminine). OSB is a little more masculine. Usually used at the beginning of a sentence to show excitement.
OSB, that was a close call!
OSB, did you see that!?
WTF!? OSB, you have got to be kidding me! I do not believe it!
OSB, someone stole my car!
by soyousay June 03, 2008
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An "over sized baby"

An adult who looks and behaves like an oversized baby. One who exudes OSBisms, that is, the characteristics of an infant.
George Dawes in Shooting Stars.

Many examples of OSBs are apparent in todays workplace. See gibbering fatty OSBs with no hair and shiny heads, that babble and whine all day. Fuelled on sugar and coke these sloths portray the characteristic behaviour of an oversized baby (OSB).
by The oversized baby October 12, 2007
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OSB (Op-Sex Break) This is when you go on a break from a member of the opposite sex. Until you find the right person, you do this normally after a slutty streak to regain dignity.
Andrew B: Get with me!
Zakiah: no... im on an OSB!
Ken: Good on you.
by kenthelegend August 06, 2010
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