Any of the long boards laid over joists to make a floor.
The floor of a car.
To sink the gas pedal into the floorboard of the car, in order to bring the car to the highest possible speed.
A bodyboard or bodyboarder.
A hermetically sealed top piece on a microchip such as the integrated heat spreader on a CPU.
In amateur radio, an incompetent operator.
A cap or hat.
One ounce of cannabis.
A restraint or control, as when "putting a lid" on something.
A kid (from the rhyming slang bin lid)
The top or cover of a container.
A motorcyclist's crash helmet.
To put a lid on (something).