E-ficiency
How easy it is to navigate a website or browser without getting angry. If you can get to what you want without yelling at your phone, it's E-ficient. If you're screaming and throwing your phone at the wall, it's not.
I had to click through five menus just to send a message. I'm not even mad, I'm just tired.
This website is like a maze. I'm lost and I'm not even drunk.
I tried to find the settings and it took me forever. This site is a disaster.