A fork of Rural Dictionary
stuffing all of your uneaten sushi in a bowl of miso soup to hide so that the restaurant can't charge you for the leftovers.
When you're at all-you-can-eat sushi and you can't eat all you thought you could eat, the Miso Swoop is a handy trick.
Really puts things in perspective.
'Man, I can't believe I got a D on my algebra test...'
'Hey, at least you don't have gangrene.'