Noun
A Gentile servant who performs certain acts which are forbidden to observant Jews on the Sabbath/Shabbat.
(neo-Nazism, derogatory) A Gentile who opposes anti-Semitism.
Source: en.wiktionary.org"Former Secretary of State Gen. Colin Powell and Mario Cuomo, former governor of New York State, each a former Shabbos goy, both share fond recollections of their youth, when they were uniquely qualified to lend a Jewish neighbor a hand." Source: Internet
Some Orthodox also hire a " Shabbos goy ", a Gentile to perform prohibited tasks (like operating light switches) on Shabbat. Source: Internet