An asshat is a person who would generally use you to get higher up in the world thus leaving you behind in the dirt. They would pretend to be your friend to get items money or break your heart for the fun of it.
A short little man who lives in his mom's basement that pretends he's a well-respected world renowned sports writer, when in fact - he's just a douche who thinks too highly of himself. Suffers from little-man syndrome.