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A tattoo on the lower back that is typically worn by women. Also known as a tramp stamp.
Hey, that girl has an ass hat. She must have taken lots of dicks.
ass hat by snikt! October 29, 2008
One who is such an asshole or a dumbassthey wear their ass for a hat on a regular bassis. As in their head is in their ass hole.

An alternative definition is a hat for one's donkey.
I do say, that man seems to have his head in his ass everyday. I do declare him to be an ass hat.

Or:

Sean's hat looks very nice.
Ass Hat by ko1n November 10, 2004
1) Ass hat - a term used by Agent Booth in bones episode "The Sin in the Sisterhood " season 6 episode 16

Agent Booth uses the term in a joking conversation with bones talking about the victim & his multiple marriages

2) The term Ass Hat is used to describe someone who is being stupid or someone who has their Head up their ass
Bones : "moron is a little harsh to describe someone who is living a life style you are uncomfortable with "

Booth : "Ok how about nitwit or doofus? "

....
Booth : " are you agreeing with me"

Bones: " only so far as the victim should have realized, how complicated his relationships would become in our present culture "

Bones : " in that case and in that case only he -he was a ... Nitwit (laughs)"

Booth : " (laughs) he was a bonehead"

Bones: " I like that it's very appropriate for my profession"

Booth: " (laughs) how about this ASS HAT... The guy was a real ASS HAT"

Bones: " we're bad (laughs)"
Ass Hat by imblonde007 August 5, 2014
someone who doesn't think before they act
Devin was a real ass hat when he did whatever he wanted without thinking of the repercussions, and was disrespectful to Kynzi on her birthday
An unknown species of hat that is also a name for someone
Yo Jimmy over there be fuckin with that ass hat
Ass hat by Ghettostepmom October 24, 2018
A person you would like to forcibly stick on a hat rack so they can do no further harm to themselves or others. Depending on the degree of Ass Hat depends on whether you use lubricant first.
You would have to be a real ass hat to pee into an electrical socket.
Ass Hat by madjazz May 18, 2005