I don't know who the fuck is Mae, but mae it's a word that is used in Costa Rica to refer to another person. Also, depending of how long you say mae, it can express concerned and if it's repeated a lot it can express excitement.
Conversation:
Mae, quién putas es Mae?
Mae no sé, pero seguro es una carepicha.
Concerned:
Maeeeee, creo que la cagué...
Excitement:
Mae mae mae, vea esto!!