It is spoken (or written) in a form of language that I can't make head or tail of - it might as well be in Greek for all the sense I can make of it. The first recorded use is in Shakespeare's Julius Caesar.
something is incomprehensible, it may have been explained perfectly, but I have not understood a word of it
It is a more formal way of saying goodbye.
It means to fight in war.
that greek people was on drugs and was drunk that they was saying all kinds of languages that they said that is how u speak greek
I am not Greek but my best friends are so I hear this all the time. "Xilo" is Greeklish for the Greek word for "wood". Greeklish is a way of writing out Greek words using the English alphabet instead of Greek characters. To spell it out phonetically for an English person it would be more like "Kseelo". Often when Greeks use the word "Xilo" in everyday speech, it is within a saying, "Tha fas xilo" which in English means, "You're gonna eat wood." This saying is like saying to someone, "you're gonna get it".
Gia Sou/yiasou they all mean "hello" in Greek
Cant understand it at all
It means "Go to the crows.", which is basically the Greek way of saying "Go to hell."
Pangaea
'I do not understand it at all'
Nope. Not at all.
'All earth' or 'all land'.