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1.
When the roof of your mouth gets all torn up after eating Cap'n Crunch or some other rough food.
I get Cap'n Crunch mouth after eating 2 bowls of that friggin cereal!
by Carla Reyes December 31, 2007
 
2.
When the roof of your mouth is shredded from eating food that is crispy or porous like some breakfast cereals.
I have Cap'n Crunch mouth from breakfast and the roof of my mouth needs time to recover.
by Bamafan1 October 12, 2011