[om-nuh-sham-buh lz]
noun, plural om·ni·sham·bles. (used with a singular verb)
  1. Chiefly British Informal. a situation, especially in politics, in which poor judgment results in disorder or chaos with potentially disastrous consequences.

Origin of omnishambles

2009; omni- + shamble1; first used in the BBC TV series The Thick of It, a political satire Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018