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big O an orgasm, usually intense. "He got me to the big O last night. by Starla Pureheart June 29, 2002 16 313 l 60 Big O notation Article Talk TA Big O notation is a mathematical notation that describes the limiting behavior of a function when the argument tends towards a particular value or infinity. Big O is a member of a family of notations invented by Paul Bachmann, ‘ Edmund Landau, 2 and others, collectively called Bachmann-Landau notation or asymptotic notation.