Definitions by soyousay
OSB
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.