An object used to cover the remains of your leftover food when you don't want the cook to know you hated it.
When you put your friend's empty plate upside down over your full plate, resulting in concealed wasted food.
"I found a hair in my meatball, so I'm taking your empty plate to use as a dish hat."
"Come on, Honey, or we'll be late for my Mom's Thanksgiving dinner!" "Just a sec, I'm grabbing the dish hats!"
"Girrrrl, if you don't put more hot sauce on dem wings, Imma throw a dish hat on 'em!"
"Oh, did you finish your taters already???" "No! They're under my dish hat!"