Top Definition
The upper portion of the inside of the mouth. More commonly and incorrectly referred to as the "roof" of the mouth. This doesn't make sense because it's inside, like a ceiling, not outside, like a roof. The scalp and hair are the roof of your head, and your mouth has a ceiling.
Jim: "Hey Dan, want some tortilla chips or some Captain Crunch?"

Dan: "No thanks. Last night, I made a pizza in the oven, and like an idiot, I bit into a piece right away. The hot cheese burned the ceiling of my mouth. It hurts. I need to eat apple sauce for a few days".
by orangek July 20, 2011

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