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A mad c is when someone does something so dumb or so cool it makes your brain explode. It's also your best friend, so you can't hate them no matter how much they annoy you.
You: "That kid just ran a marathon in socks." Me: "That's a mad c."
You: "He ate an entire pizza in one bite." Me: "That's a mad c."
You: "She got suspended for fighting the principal." Me: "That's a mad c."