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The term originated back in the theatre, where the cheapest seats were those way at the bottom floor and where people purchased peanuts because they were the cheapest snack. If they disapproved of the performance, they would throw the peanuts.

Howdy Doody, a show that started in the 1940's (not 50's), the children in the crowd were considered the "Peanut Gallery."
Vaudeville era man: Ay! This show sucks! You all suck! get off the stage! *Throws peanuts

Announcer: No more comments from the peanut gallery!!!!!!

Vaudeville era woman: Throw more nuts chap!!!!
Vaudeville era man: I'll give you some of my nuts instead..
by j-reg August 17, 2012
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4
george bush's presidential cabinet
or
a group of (sometimes stupid) people that make comments on something they are watching or listening to; spectators with a verbal opinion
"we will not tolerate comments from the peanut gallery," said the announcer.
by kelly meier March 04, 2004
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two dudes who finger the same girl in the back of a suburban on the way to a sporting event
The peanut-gallery was very busy on the way to the game last night.
by urgunnalovemynuts May 05, 2009
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