I'm sloughing off at work. I didn't accomplish any today because I was being just plain lazy.
That doesn't bode well for your future at the company. How did you spend your time?
I watched Game of Thrones the whole day.
At your job you should do your work instead of watching Game of Thrones all the time. You should not be lazy and just complete your work at your job.
I wasn't up for it.
You need to think long and hard about your job and why you're there. Streaming TV shows at work will result in disciplinary action and ultimately, termination. If you're bored and unfulfilled at your job, find another one more more suitable to your aptitudes and interests.