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!

OSB by soyousay June 3, 2008

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OSB

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!

OSB by yeetyoongi January 24, 2019

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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).

osb by The oversized baby January 4, 2009

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Oh shit bitch

when something is unexpected and suprising like your playing a game and someone scores on you... you say OSB ! Oh shit bitch.

osb by sammyj4432 August 31, 2010

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