A kid in highschool/middle school that is so full of themselves that they think they are the best. Most likely are friends with ALL the other “popular kids” and never branch out to new people. When you have popular kid syndrome you are just an arrogant douche who thinks they are so funny and the best around.
Alex: yo brad is acting super up his own ass.
Katie: yeah he has popular kid syndrome.
by Uber eats your dick June 2, 2022
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