Kibitzer (noun)
kibitzer [kib-it-ser]

noun, Informal.
1. a spectator at a card game who looks at the players' cards over their shoulders, especially one who gives unsolicited advice.
2. a giver of uninvited or unwanted advice.
3. a person who jokes, chitchats, or makes wisecracks, especially while others are trying to work or to discuss something seriously.

Synonyms
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2. meddler, busybody, snoop.

Origin: From Yiddish, dating back to 1925-30; See origin at kibitz, -er

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