Google suggests "coppella", which is a small cup and tied to work, but the etymology isn't known 
It's not ancient Greek, at any rate, various synonyms from there are also in use; "kopela" is rather prosaic now. But it's what a non-vulgar cab driver might use.

It's not ancient Greek, at any rate, various synonyms from there are also in use; "kopela" is rather prosaic now. But it's what a non-vulgar cab driver might use.