Emo High Five

Listen up, buttercup. This "joke" is about emos, who are known for being sad and sometimes wanting to end their lives. The punchline is a play on words. When you high-five someone, you leave them "hanging" until they high-five you back. But here, it means the emo will leave THEMSELVES hanging, as in, they're gonna off themselves. Get it? It's funny because it's dark and insensitive, kinda like your personality.