peanut gallery

. 1. The cheapest seats in a theater, being typically those farthest from the stage, as in the uppermost balcony. [ PJC ]

2. In a television show for children, the section where visiting children sit as guests during the performance. [ PJC ]

3. Hence: Any group of children, or the chidren in a group of people; as, let's have no noise from the peanut gallery. [ Colloq. ] [ PJC ]