What is a "golden sombrero" in baseball slang?

What is a "perfect game"? What is it called when the fielding team records three outs on a single play? What is a "Texas Leaguer"? What does "can of corn" mean in baseball slang? What is a "southpaw"? What is the area where relief pitchers warm up called? What is the name for a pitch that is thrown with little spin and moves unpredictably? Which award is given to the best pitcher in each league every season?