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Explanation: This is a Yiddish word, sometimes also used in English. To kibitz it to look on from the side. For example, when some people play cards and someone else is looking 'over their shoulders' at the play, that person is kibitzing, or is a kibitzer.
I agree with the proposed answers on Shvartze (Yiddish for black, and used sometimes as a derogatory term for someone with dark skin coloration) and Mumser (Yiddish version of the Henrew word Mamzer - illegitimate child, also used to express admiration of someone being particularly shrewd or in reluctant admiration of an opponent who 'pulled one over' you).
Explanation: I'm not familiar with the first word, but the other three are in Yiddish. Shvartze literally means 'black', but is often used as a derogatory term to describe people who are not of European descent. Mumser is a term in Jewish Law, referring to children born to a married woman out of wedlock. It is often used to say about someone that they are shrewd.