The story
Reduplication; further etymology unknown. Possibly of Ancient Greek origin, from ὅλος (hólos, “whole”) and βόλος (bólos, “a throw with a casting net”) or βῶλος (bôlos, “lump”). Alternatively, a pseudo-Latinism derived from a reduplication of bolus with whole. Compare similar pseudo-Latin reduplications such as hocus-pocus and omnium-gatherum.
Etymology from Wiktionary, CC BY-SA 4.0.