Joiceline means in slang: Joiceline is a wonderful friend. She’s trustworthy and kind, funny, sweet, generous, supportive, caring, and helpful. Joiceline will always be there for you no matter what. She is a great friend and a good girlfriend. She’ll forget about you, forgive you, and then move on. She will never forget the things that you did to her. Joiceline is a great friend and I have loved her since the day I first met her. It’s the most wonderful friend you will ever make. (in Slang Dictionary, added by Emanuel Underwood)