E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
or a-Pigger-back, does not mean as a pig is carried by a butcher, but as a piga or child is carried. It should be written apiggaback. A butcher carries a pig head downwards, with its legs over his shoulders; but a child is carried with its arms round your neck, and legs under your arms.
She carries the other a pickapack upon her shoulders.LEstrange.