A little piece of food stuck between your front teeth that you are unaware of; someone often needs to tell you its there. It can usually be removed by running your tongue over your front teeth or trying to suck it out, making a rude noise.
Me: "Hi Ginn, how are you?"
Ginn: "I'm great!" (Gives a toothy smile).
Me: Whoa! (Pointing to your friend). "You've got a little dinklage on your tooth."
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