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To sit in on a conversation, meeting, card-game or online chat and offer unsolicited, informal comments. The original meaning from Yiddish (kibitzen, derived from German kiebitzen - to be an onlooker or spectator) had a negative connotation of being a busybody or giving intrusive, meddlesome, unwanted advice. However, in contemporary US usage, it has become friendlier.
She's meeting with some suits this afternoon, do you want to come kibitz and liven things up?

I'm not here as a formal participant, I'm just kibitzing.

Quit kibitzing! I know how to play Texas hold 'em.
kibitz by LiamK2 January 17, 2011
Related Words
To meddle and give unwanted advice. kuh-Ib-itz
Kibitz by The Man November 30, 2004
Giving unwanted advice or suggestion or even comments.
Like people standing over your shoulder while you are playing chess and they are like talking about your game and making comments and you want to kill them but you turn and say.. "take your kibbitzing elsewhere thank you."
kibbitz by martaseattle December 16, 2005

kitbitzer 

big sexy guy with a big fat cock that gets sucked by listric every day
kitbitzer has a humongous penis
kitbitzer by nhentai.net. February 5, 2021

kibitzer 

1.) Yiddish word for a spectator, especially in chess.

2.) Someone who gives unwanted advice, which was never asked for or is irrelevant.

3.) Someone who gives advice to people!
1.) Moshe down the street was the kibitzer for our chess match!

2.) DUDE, STOP BEING SUCH A KIBITZER!! I NEVER ASKED FOR YOUR OPINION.

3.) He's such a good kibitzer, ever since he's told me to kill my family with NapTime, the house has been 100% quiet!
kibitzer by crazykibitzer June 3, 2022
Kibitz: to sit out of a game and just watch.

Derivatives include kibitzing and kibitzed.
"Do you want to play poker?"
"No thanks, I'll play kibitz."
kibitz by Potatoes April 14, 2006