someone who is a total freaking idiot. they have their head up their ass, therefore wearing it as a hat. hence, ass hat.
by jennnnnnnnnnnnn123 August 27, 2006
by rachel January 02, 2005
a once great insult that hit the internet late 2003. While never reaching an annoying state of over use, it has now been put out to pasture due to it's use on the FOX series "the OC"
by popcultureicon March 25, 2005
1.)practitioner of ass hattery
by Jesus Barron February 27, 2008
by jjjjjjjjjjjjm August 11, 2006
Derived from the words jack ass and mad-hatter. An ass hat is someone who makes a fool of themselves in such a strange and illogical manner that no other word can define them.
"You were arrested on national television for stink palming the President of the United States at a presidential debate? You frigging ass hat!"
by Ethos June 18, 2004
Created by P. James Murray in 2002 out of Cincinnati, Ohio. Simply put, it is someone who has their head up their ass.
by ChelsBels88 July 16, 2008