The phrase "moody teen" refers to a teenager who frequently experiences changes in their emotions, often feeling upset, irritable, or sad without any particular reason. Full definition
Now, the increasingly moody teen wants to live with his birth mom and eat ice cream all day, figuratively speaking. (lavenderluz.com)
Btw I would point out that you say «Now, the increasingly moody teen wants to live with his birth mom and eat ice cream all day figuratively speaking» whereas it is the mum who says that is her theory: (lavenderluz.com)
«I went back to my teenage years to come up with the ultimate moody teen trench jean jacket,» says stylist Karla Welch. (businessoffashion.com)