"Meeting is a good sign" means that meeting is a kind of destiny, we have to be thankful, even if there is no good result later, but to enjoy the process of being together, the depth of the destiny should be cherished, have had is a great happiness, met is unlimited warmth.
The term "on the sign" is generally used in the interpretation of the sign as a great luck, all things go well. This word appears in the network self media video, expresses the meeting of the person's cherish and gratitude. If a guy says that meeting someone is the best thing that ever happened to him, it means that he thinks of that person as the best thing that ever happened to him.