Region: US | Usage example: Without the data the report is not worth a plugged nickel.

Not worth a plugged nickel

Meaning

Of no real value.

Used to dismiss something as worthless or bogus.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Plugged nickels were coins with a hole filled with metal to repair them, making them worthless and easy to spot.

Used in the early twentieth century United States when coin theft and repair were common.