It means the carb is "running over" 'cause the inlet needle valve and seat assembly is unable to stop the flow of gas from the tank into the carburetor.
The little sintered brass screen at the bottom of the air horn lets the excess gas escape without letting ambient dirt get sucked into the engine.
The problem could be as simple as the needle not quite seating... which can often be helped by rapping the fuel inlet area of the carb a couple of times with a plastic screwdriver handle, or some dirt or crud jammed under the needle, or a faulty float (a "sink") or other failure inside the carb.
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