Dive into the shocking ending of Netflix's No. 1 crime series, "Adolescence." Why did Jamie kill Katie, and what happened to him and his family in Episode 4?

According to the Cambridge Dictionary, “nonce” is a slang term used in the U.K. to describe someone who is accused of a sex crime. It is primarily used to describe someone involved in a crime involving a child, making “nonce” an outdated and rarely used word for a sexual deviant or a pedophile.

They are eventually told that, while messages between Jamie and Katie appeared to be friendly, the emojis actually suggested that Katie was mocking Jamie for being an incel—meaning involuntary celibate, which is connected to the rise of misogynistic culture, particularly among young men.