An adult who is between the age of 25-50 that still thinks they are a teenager. They dress like teens, listen to ether what's in the charts today or modern Kerrang bands like Neck Deep, Moose Blood, BVB etc and use up-to-date teen slang such as "Bae" and "On fleek".

Also born again teens often go out their way to hide their wrinkles, grey hair or the fact they are going bald with anti-wrinkle cream, hair care products and hair dye to make them as much teen like as they can.
Alan: Have you seen Liam lately?

Andrew: No mate why?
Alan: I saw him the other day. He was wearing skinny jeans and some Nike Air Maxe's with a t-shirt with the word #selfie on it and had bought some anti-wrinkle cream and some hair care products from Lush
Andrew: Isn't he 35?
Alan: Yeah he is. He told me he is a born again teenager.
Andrew: Whats one of those?
Alan: He is trying to feel and look young again I think.
by El-Manchenero November 6, 2017
Get the Born Again Teenager mug.