Hello Martin
Nikos here,
Judging by the word that you know,you have definitely came for holidays here!
Yamas means something like cheers that you say, before crashing the glasses of wine when you are in happy situation.like drinking with friends while eating,or dancing…you know,that stuff!nice!
something easy to remember is "Geia" which means Hi,and "Geia sou" which means both hello you when you see someone for first time and good bye when you see someone for last time at this day.
so,
Geia sou!
