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A fuckle is when you're stuck in a mess so bad that the only thing you can say is 'fuck' and you're too tired to even say it right.
I got stuck in traffic, my coffee spilled, and my dog peed on my shoe. Just fuck.
My boss yelled at me for no reason. I said fuck. He yelled back.
I tried to fix the toilet, it exploded. I said fuck. It said fuck back.