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A smug way of saying you're the only one who can save your butt, and you don't need anyone else's help, because you're too lazy to even bother asking.
Man, I cut my own slack. You're still crying over your math test, and I already finished my homework and my pizza.
I cut my own slack. You're still waiting for your mom to pick you up, and I already drove to the store and back.
I cut my own slack. You're still arguing with your friend, and I already finished my project and got a snack.