A word originating from the Supreme Court Case Mapp vs. Ohio. Because of the nature of the case, Mapp has come to mean a wide myriad of things and has come to be sort of a way of life. Most often, Mapp is used as a replacement for already existing words.
Before Madeleine blew out the candles, Cici sang her Mappy Birthday
Madeleine: Wow Marshall, you are so well dressed.
Marshall: Mapp you!
Someone who has a beer belly, dates girls way younger than his age, and hasn't had his balls drop completely. He is often found hanging out at your local elementary school, waiting for his next victim.
What are you doing to that 10 year old? You are such a Mapp.