A jumbled, disorganized mixture of several various things. The "stew" he served was just a bizarre mish-mash of stuff he had left over in his fridge.The story is a mish-mash of inconsistent themes and plotlines that never go anywhere.
mash
in. to neck and pet. (Collegiate.) Who are those two mashing in the corner?
mish-mash
and mish-mosh (ˈmɪʃmæʃ and ˈmɪʃmɑʃ)
n. a mixture; a disorderly conglomeration. There’s no theme or focus. It’s just a mish-mash.