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To have ones hat on ones ass. The ass is not the most common area to place ones hat. Hence the implication that to have ones hat on ones ass is just plain stupid. Often used when drunk to refer to someone who has just broken a pinki promise.
"You sir are an asshat" "Tom come back here, quit being an asshat" "I'm sorry I was an asshat"
by Kurt (biscuits) Russell December 09, 2014
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16
a unit vector in the ass direction
(similar to i hat, a unit vector in the i (or x) direction, j hat, k hat, etc.)
"Andrew is such an asshat."
"Totally. His unit vector is definitely pointed in the ass direction."
by andiland July 20, 2005
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18
one who is oblivious to the world around them,lacking common sense,their head might as well be up their ass.
ec isn't going to vegas so he can put rocks around his yard,what an asshat,he is going to miss the best time ever!
by LAUGHING SKULL November 15, 2006
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19
One who shows so much ignorance to the world around them that it seems as though their head has been shoved into their rear-end, using it as a hat.
Idiot: 9/11 really happened on 9-11???
Person making fun of idiot: No shit, you asshat.
by kikurasshat April 02, 2009
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20
The process of shoving your head up an ass, all the way, and wearing it for whatever reason you wish.. to block the sun, or fashion exetera.

Asshat
"I had my first ever Asshat yesterday, what an experience!"
by Stinky Nan June 03, 2017
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21
1. milder form of asshole. comes from old online forums. all swearwords, including any combination of "ass" and "hole" was considered vulgar and would get your message censored and possibly flagged, but "ass" was just fine. so ppl used "ass hat" cuz everyone knew what you were referring to plus you avoided censorship and web filters.

2. ppl now use it to refer to brownnosers or bull-headed douchbag asshole bosses.
"Look at the asshat typing in all caps all the time. What a douche bag."

"dude my dillhole boss put a profanity filter on the company internet servers. what an asshat."
by lurpy January 31, 2008
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