A few bricks shy of a load.
bats in the belfry.
Watch the submarine races with your girl.
When my mother worked on the Manhattan project in Tennessee. the FBI. made them stop referring to Oak Ridge as "Podunk". The FBI felt that name would arouse interest rather then deflect it away. I believe a comic strip of the time was set in the town of Podunk.
Bill D.
on dit; It might have been "Dog Patch"