facking knackered - You're so beat you could take a nap and still feel like a do

You're so beat you could take a nap and still feel like a donkey kicked you.

I had to walk to school in the rain. I'm facking knackered.

I played video games for eight hours straight. I'm facking knackered.

I got yelled at by my mom and did my chores. I'm facking knackered.