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A person whose lip protrudes beyond their bottom lip and chin, usually due to an overbite, causing the person to look like a character off of the simpsons. Commonly seen with overweight children and adults who have a very low IQ.
"Why does that fat mean kid's upper lip stick out so far?" "Well Jr. he has a simpsons lip"
by Jack Meehauf March 28, 2017
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