ZIGZAG, v.t. To move forward uncertainly, from side to side, as one carrying the white man's burden. (From zed, z, and jag, an Icelandic word of unknown meaning.)
Source: The Devil's Dictionary, 1911.
-- Ambrose Bierce, (Jun 24 1842-1914), US journalist, short-story writer; He was a noted wit, satirist and sardonic short story writer who disappeared while covering the Mexican revolution.