It's muffi time, 'cause I wanna die, die, die.
Muffi Time
Explanation
Explain Bear
Listen up, you knucklehead. This "joke" is about wanting to off yourself. "Muffi time" is a play on "muffin time" from that annoying kids' song, but instead of wanting a tasty snack, this genius wants to, uh, meet his maker. Get it? It's funny because it's not. Go back to banging rocks together, ya neanderthal.