A type of person seen as self devoting to making the lives of everybody around them a bit worse than they were a minute before they met each other. That term can be however used by one such person to hide the fact of what they really are, a callous piece of shit.
Did you see that prick who calls himself an asshole go last night? The moment he drove home from the party, he reached down for his phone and crushed three bushes from Derek's front yard and we never heard from him since.