This rage power from Ultimate Combat says it costs 2 rounds of rage to use. Does that mean a round in which I use it I expend 2 rounds of rage or that I'm raging that round to use the ability and then it costs me another 2 rounds to use for a grand total of 3? Thanks for any clarification.
"Once per rage, as a swift action that costs 2 rounds of rage..." So 2 additional rounds worth of rage. You are burning though your reserves by using this Supernatural ability.