Source : Webster's Revised Unabridged Dictionary (1913)

Omnium-gatherum \Om`ni*um-gath"er*um\, n. [A macaronic compound
   of L. omnium, gen.pl. of omnis all, and E. gather.]
   A miscellaneous collection of things or persons; a confused
   mixture; a medley. [Colloq. & Humorous] --Selden.

Source : WordNet®

omnium-gatherum
     n : a motley assortment of things [syn: {odds and ends}, {oddments},
          {melange}, {farrago}, {ragbag}, {hodgepodge}, {mishmash},
          {mingle-mangle}, {hotchpotch}]