stop!!!

Soon You'll turn into Tweek from South park.

Wow, that is a lot of coffee I do not know how you were able to drink all of that, but I guess that it's nice that you at least have nice coworkers, and to be honest I'd rather drink the coffee than have to run around making other people all that coffee.

You should just tell them no using manners for example no thanks but thanks for asking and I would after cup 2 but everyone has their set limits but this isn't that bad of a fml nothing really bad happened here

Damn, you must have had to pee a lot!

It's not rude to say "No, but thank-you". If you want it to sound a bit nicer you can also say you already have a cup, or that you just had one and aren't ready for another. That much caffeine could be very harmful though, I'd rather be a bit rude and take care of my health... but it's not rude anyway. And how are you not living in the bathroom? I would think after 17 cups you would be unable to come out of the bathroom for at least the rest of the day. Coffee is really good at making a person need to pee, a lot.

you are so caffeinated that you can see smells.

Just have a cup in front of you. That way they would not buy you anymore

There's nothing impolite about saying "No, thank you."

Just say "No thank you".