Fourth Girl 

That one girl in the group of girls (which there are usually 3 popular ones) that is right on the cusp of being cool, but she's not yet she is constantly thinking she is and doing everything the other girls do to fit in. When she is not around the other girls dis on her.

Man look at Fourth Girl over there wearing that crazy get up trying to be cool.

Fourth Girl by SlimShugga November 6, 2012

Fourth Gen IT Girl 

Fourth Gen IT Girl is used to describe Jang Wonyoung from IZ*ONE who is much more successful than you.

Did you know the Fourth Gen IT Girl is the youngest ever person to be the Global Muse on Innisfree?
The Fourth Gen IT Girl was a member of the best-selling girl group in 2020 and her group is known to be the Fourth Gen Leader.

Fourth Gen IT Girl by Xobee September 1, 2021