A mishmash is a random bunch of odds and ends. Many people have a mishmash of things in their basement or garage. A pile of old keys, one sock, four paper clips, and a water bottle? Total mishmash.
Many houses have one kitchen drawer full of a mishmash of pens, rubber bands, carryout menus, and gum, for example. If you write a last-minute research paper, you might wind up with a mishmash of random ideas and opinions. The word was originally spelled with a hyphen, mish-mash, and before that it was mysse-masche, which had to do with mash, as in a bunch of soft food chucked together and fed to pigs. Another word for mishmash is hodgepodge.