Top definition
A self-inflicted barrage of seemingly endless food similar to that of a potluck but much more spontaneous especially when substances are involved. One may feel more inclined to be creative with mixing certain foods together (such as macaroni and cheese on pizza) as well.
"With all of this food, we can have a most epic Midnight Mouthdown."

"This feast is the ultimate mouthdown."
by KrankenKopf February 03, 2010
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2
Nikolais Caige
This pizza sure reminds me of that Mouthdown!
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