Meaning
What does Youngin mean?
Youngin (plural youngins) is a common term used around the DMV area, which is Maryland, Virginia and Washington. It’s a country slang referring to a child, kid, or a young person.
It is another way of calling out someone who is younger than you.
Origin
What's the origin of Youngin?
This expression possibly comes from the Dutch word for boy: yongen pronounced the same as “Youngin”.
Even with this information, the origin of the term is still uncertain.
It just a kind of expression that not a lot of people use or know about, so determining the origin of this one is harder than for another, more well-known term.
Spread & Usage
How did Youngin spread?
This is a term not so much more different from other ones.
It can very much be that this is a kind of term that spread from mouth to mouth, and more people started using it instead of the word ‘young’ because it just sounds cooler.
There isn’t a lot of information about this country slang, but we can definitely hear it from native English speakers. The first definition on Urban Dictionary was written in 2003.

External resources
- The Online Slang Dictionary – Definition of youngin’