So not very very English

I'd say that schtick (shtik), schmuck (shmok) and putz (potz) are just as English as mousse, yacht, and borscht. A schlemazil is somebody back luck is always happening to. May be from shlim mazel, lit. 'bad luck' in Yiddish. Might not be.

Ceci n'est pas un seing.