Informal. the rearmost and cheapest section of seats in the balcony or the uppermost balcony of a theater.
Slang. a source of insignificant criticism: No remarks from the peanut gallery!
Peanut Butter Nightmares And Other Lesser-Known PhobiasDo you suffer from one of these unusual fears?
Origin of peanut gallery
An Americanism dating back to 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019