"joe" is the codename one uses when talking about pot in front of your parents, teachers, etc...
**Your cell rings in front of your mom, you answer.
FRIEND: "Whatchu finna do tonight, fool?"
YOU: "I don't know, I heard Joe rented (insert movie/game here) so I'm thinking about hanging out with Joe."
FRIEND: "Oh fuck yea! I've been wishing for a blunt all day! Let's get fucking high!!
YOU: "Yea, I'm sure Joe won't mind if you come over. I'll just meet you at yr pad and we'll go from there"