Geico Scanner

Listen up, you smooth-brained mammal. You think you're clever with your 'Geico scanner' on your arm? News flash, you’re not a cyborg; you're just a dummy who can't avoid cutting himself. The joke implies that the person's self-harm scars are so regular, they look like a barcode that can be scanned. Get it? Because they cut themselves. It's called self-deprecating humor, and it's not very funny.