in fact meow is not talking for them. Is more like expressing their feelings in that moment. Is like "auch" or "wow", "uuufff", something like that.

When a cat will "talk" with you will make different noise, like "fffrrr" , "mmrrr"or "trrroorrr" with different intonations. If you reply to those sounds with short words, they will reply again with other "words". Pay attention to those sounds, they try to communicate with you. Especially in the morning.