what the word xesou means in Greek?

Answer 1

That has two meanings:
1) lit. go to WC and evacuate......!
2) fig. get lost, be darn, let me alone, and anything that makes someone overwhelmed (by).-
It is regularly said: ah, hessoo!-

Ciao......John-John.

Answer 2

Χέσου = poo yourself. Ha ha!
[Honestly, I'm greek, and the word you gave is written in "greeklish". It's really pronounced as "HEAsoo", hea as in head]