This use to be a Greek insult and the complete word is more(2 syllables, mo and re). Now it is commonly used amongst friends at the end of sentences or at the beginning to refer to the person that they are talking to.
Re, where were you.
Get me a coffee re.
This is Greek coffee enjoyed by many Greeks around the world and which is not served in many locations. It is exclusively served in authentic Greek Cafes(Coffee House).
Hey buddy, give me one cafe metrios.
What do you mean you have no cafe metrios?
Isn't this Star Mitso's Cafe, a Greek coffee house, in which they should serve cafe metrios?