I have been told that in Greek, exwhysee can be loosely translated to "I have cum". Any Greeks here to explain that?
Oh yes. There are ancient inscriptions to prove it.
Haha. Seriously, well I know nothing about modern Greek, the word for "I'm coming" in classical Attic is difficult to come by. There are exactly three and a half million words for "fuck" and one for "orgasm" ("orgasmos") but the best I could find for "I'm coming" is "ekmiaino." Unfortunately, "I'm coming" is one of it's rare uses - it would more commonly mean "I am defiling you." So, uh, yeah...
"Orgao" is where "orgasm" came from and sounds more fun ("I am gonna blow") but I don't know if that was ever used that way... Actually, knowing human nature, I'm sure it was. Especially where pagans are concerned. They had a lot more fun.