Idiotic, stupid. To act like a moron.
From the popular insult "to have your head up your ass". This imagry leads to ones ass being placed on the head like a hat, hence "asshat".
Synonyms for Ass Hat
On this page, you will find 30 slang terms related to Ass Hat. Some of the top words include: plooker, asshat, Dumas, toe nadger, ignant idgit, and 25 more.