Top Definition
An adult who behaves like they never left high school.
A permateen is someone who still dresses like a teenager, gossips constantly, texts OMG to someone at least 20 times a day, and makes fun of other women for their appearance.

In men, it is a guy who relives his glory days of high school constantly, sleeps until noon every day, parties all night, spends too much time in the bathroom, and doesn't understand the concept of responsibility.
by Madmama April 13, 2010

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