Fractional currencies have often been called "shinplasters" in the past.
Actually, this term of derision was first used by American soldiers in the
Revolution. Then paper currencies with a face value of less than a dollar
were regarded as being so worthless that troops reportedly stuffed them
into their stockings to protect their shins from being chafed by their
boots. Later, during the Civil War, southern soldiers held these small
notes with equal contempt and referred to them too as shinplasters.