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an alternative way of saying OMG except its COOLER AND DIFFERENTER. generally an exclamation of surprise or anger. shortened as OSB
Guy: "YOU FUCKED MY MOM?! OH SHIT BOB!!!"

or

Girl1: "He just asked me out! Ahhhh OSB!!"

Girl2: "OSB!!"
by roro ownz urmom March 23, 2009
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