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A roar-like expression most frequently used by a dominant alpha male while displaying his obviously superior physical strength to other males, or to himself in a mirror while flexing biceps.
As Terry confidently rolled up his sleeves to reveal his protruding biceps, he passionately gazed into his washroom mirror and asserted with a rumbling roar: "AH-KUM-BAHHHHH!"
by DatKneeGrow May 18, 2013
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