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A play on the phrase "Rock That" (two fists meeting as a greeting or celebration) used during Obama's run for presidency as a mockery of the fact that he would"rock that" in celebration.
Person 1: "Dude I just scored an A on my history exam"

Person 2 (Dude): "Nice! Barack-that!"

Persons 1&2 tap fists.
by JDeathScript August 04, 2010
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