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A pro call out is when you see a famous professional, usually an athlete, in public and you loudly proclaim that you are better than them at whatever they are known for. Must be done in a manner to call attention to yourself and you must be an amateur.
Random guy who sees Shaun White in an airport: "I can't believe you're a professional snowboarder, I am so much better than you!"

His friend: nice Pro call out but everybody knows you suck
by vtmdroman July 06, 2011