A person who only thinks of themselves for their benefit... You are depending on this person for something simple, or asked a question. They're smiling at you but thinking "screw you and your happiness cause I'm feeling sad today/living a messed up life. So I'm giving you 2nd rate service."
(I was having fun) then that bartender served us weak drinks. He's an AssHead !
That AssHead parking cop gave my (new car) a parking ticket !