1 mixture, confusion, hotchpotch or US and Canadian hodgepodge, pot-pourri, gallimaufry, farrago, mishmash, jumble, mess, shambles, olla podrida, mélange, medley:
The building is a hash of a dozen architectural styles.
2 fiasco, disaster, botch, mess, Slang Brit balls-up, US snafu:
The council really made a hash of its housing policy.
3 Often, hash up. mangle, mess or mix up, make a hash or mess or jumble of, muddle, bungle, botch, mishandle, mismanage, ruin, spoil, butcher, Colloq foul or louse up, screw up, muff, Brit bugger up:
Our plans for a holiday have been all hashed up.