Quoting: Eurola
My Italian friend calls me jokingly at times "Polack' and I tell her she is such a 'wop'.
call her a Dego (day-go) means dirty Italian. I say that to my Italian friends all the time, or combine them and say Dego Wop.
but secretly the joke is on them, all Polak means is - person of Polish origin. and so they are basically saying "Hey person from Poland, get your @ss over here"
and if your looking to call an Americna anything, call them Hamburger. If they are smart enough to get it they'll figure out your making fun of them for having a McDonalds and BK on every street corner.