What does the phrase 'tagging the door' mean in the following sentence 'She could see him amid the white-shirted boys playing stickball on Wald Street tagging the door of Joe Preble's black REO'?

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What does the phrase 'tagging the door' mean in the following sentence 'She could see him amid the white-shirted boys playing stickball on Wald Street tagging the door of Joe Preble's black REO'?