higgledy-piggledy adjective in a confused jumble UK,1598 Probably derived as a rhyming elaboration of the disordered huddle in which pigs exist.
Wired up in pure Heath Robinson fashion, which is an old English phrase that I think means higgledy-piggledy (which is an even older English phrase). — Tony Wilson, 24HourPartyPeople, p. 145, 2002