ECJ

ECJ means "Emo Child Joy" starting now.
Referred to people who are a young newgen emo.

Person 1 "What can you say to an emo person if they are happy?"
Person 2 "Well in short terms, that's an Emo Child Joy"

OR in texting language.

Person 1 "WTF is ECJ?"
Person 2 "Emo Child Joy, or a young emo"