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1. A natural love of or enthusiasm for sports or athletics. The sporting blood running through this town means the people here show an unmatched enthusiasm and loyalty for all of their local teams.
2. An adventurous, risk-taking, and/or thrill-seeking personality or disposition; exceptional competitiveness; readiness to accept a challenge. This business isn't meant for the timid. Only those with sporting blood have a real chance at success. I'm not one to stand up to bullies, but my brother has sporting blood and backs down from no one.
Willingness to take risks, as in His sporting blood won't let him stay away from the races. This idiom uses sporting in the sense of "associated with gambling."