When someone both possesses and uses their massive hypothetical kahunas. Commonly found in people who take risks or face potential danger that others would not. Basically balls of steel.
Thomas: "There's no way the bus driver is going to keep making this turn. He will Have to back up"

Tyler: "No, this guy has kahunism. He might hit them, but he's not stopping."
by Spray N Pray April 04, 2011

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