A somewhat obnoxious way to refer to a young woman; if she were a "young girl" then she wouldn't be much older than seven years of age. Just use "girl" or "maiden" or "young woman" to refer to a woman who is clearly older than twelve years of age; "young girl" and "young maiden" suggest an underage girl.
From "Rent".

"He had the world at his feet
Glory
In the eyes of a young girl
A young girl...

One song
A song about love
Glory
From the soul of a young man
A young man..."

A "young girl" with a "young man"? Isn't that concidered child molestation?
by Lorelili September 2, 2006
What all the young pedobears of the world love. They are always followed by stalkers and generally love all the attention they give them.
Son: Daddy who are thoes young girls across the street.
Father: I'll be back in an hour or so.
Son: But Daddy, why are you wearing your bear suit...
by Ornathorincus December 20, 2018
The Theory that young girls bring 3 things to the table when dating them.

1. Drama 2. Headaches 3. Sex......two of these they supply an abundance of, or too much. The third, they just aren’t that good at, or have enough experience.
Remember every time those hot little young sluts come up and hit on you, or you match with another one on Tinder, and take her home and smash her out, cause she’s not wearing panties.......repeat the Young Girl Theory. Is it worth it, and will you have enough patience and Advil to last?
by GIRTHQUAKE72 November 20, 2019
n. the psychological condition of being excessively opinionated or critical, often to the point of pettiness. Neither 100% ubiquitous nor exclusive to young white girls, though most common in them.
"He complained about the temperature in the restaurant four times and sent his food back twice."

"Oh, yeah. Bad case of young white girl syndrome, that one.
by Ben Heddon March 25, 2015
n. the psychological condition of being excessively opinionated or critical, considering one's intelligence. While neither 100% ubiquitous nor exclusive to young white girls, it is most common among them.
"She kept bitching about the temperature in the restaurant and kept sending her food back."

"Oh, I know. Bad case of Young White Girl Syndrome that one."
by Ben Heddon March 25, 2015