ECJ

"ECJ" means "Anyone Can Join". Usually used in usernames telling people that anyone can join the account if wanted.

Username Example: Forever_Happy_ECJ

ECJ

Abbreviation for East Coast Jew

Favoratism is often shown from one East Coast Jew (ECJ) to the next.

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"