Top Definition
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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