The Collaborative International Dictionary of English v.0.48:

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; a hodgepodge. [Colloq. & Humorous]
   --Selden.

   Syn: hotchpotch, odds and ends, farrago, motley collection.
        [1913 Webster]

WordNet (r) 3.0 (2006):

omnium-gatherum
    n 1: a motley assortment of things [syn: odds and ends,
         oddments, melange, farrago, ragbag, mishmash,
         mingle-mangle, hodgepodge, hotchpotch, gallimaufry,
         omnium-gatherum]