Bad guess, CarolC. Jay Z is flippin' off the people who dare to criticize his brand of thuggery.

That may be so, but that doesn't tell us where he, himself got the phrase... only how he, himself, is using it. He probably got it from the same milieu as the one in which Bobert first heard it. Obama can just as easily have gotten it first from that milieu as well. We really have no way of knowing.