A term to classify men with no career and/or little education. Mostly due to the result of juvenile partying and screwing women irresponsibly, often leading to a pregnancy that ruined any chance of success.
-Derived from Brigham Young University
-Term coined by Los Angeles 97.1's Tom Leykis infamous radio show host
Jesse: Hey Eddie, how's everything working out at UCLA?
Eddie: nahh man I got my girl knocked up and can't focus no more, my pop Tom said we belong at BYU..
Youngun is a term used mostly by older generations to refer to anyone younger than them. Usually used to refer to young children to teenagers. Can be used as a term of endearment or an insult.
Younguns these days. They need to learn some respect for their elders.