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What you say to a friend when you don't want to hang out and you're too lazy to explain why. It's like you're telling them to go to hell but in a friendly way.
Nah kid, I'm too tired to go to the mall with you. I'd rather eat my feelings.
Nah kid, I'm not getting up for this. I'm still in my pajamas.
Nah kid, I'm not doing that. I have a life, and it's not you.