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jackace

adj.
Someone who thinks that they are cool and/or smart but really isn't.

Or

Someone who is dumb,annoying or lame.
Example 1

Dude 1: Two plus two is four!

Dude 2: Wow, you are such a jackace!

Example 2

Guy 1: That was awesome! (After doing a stunt badly, not realizing it)

Guy 2: Shut up jackace! You did it all wrong!

Guy 1: No I didn't!
by Word Corrector September 18, 2009
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Jackface

A term used to describe the contorted facial expression Matthew Fox's character, "Jack Shephard", makes when he is angry, yelling, or just plain acting crazy on the television show "Lost"
"Did you see that awesome Jackface Jack made when he was shooting at 'The Others' last night on Lost?"
by Bob the Rook July 30, 2008
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Ultimate Jackface

The Ultimate Jackface is a meme from the Lostpedia Forums in which the member JoeyeoJ discovered a moment in the penultimate Lost episode "What They Died For" in which Jack Shephard, played by Matthew Fox, looks directly at the camera. The original poster continued to post various pictures, including Lost screenshots, in which the face is inserted into the shot. Sometimes text is included and sometimes they are in a multi-panel form like a Dinosaur Hed, a similar meme from the Lostpedia Forums. Other members of the forum have also taken to making these. The name references the various faces that Matthew Fox makes while playing the character of Jack, which have become known as Jackfaces.
Have you seen the Ultimate Jackface yet?
No, what is it?
Dude, it's crazy! Foxy looks directly at the camera!
He breaks the fourth wall? In Lost?! I gotta see this!
by Yossarian2342 May 25, 2010
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Jackception

The act of jacking off to a video of yourself jacking to a video of yourself jacking off in an endless chain
Brandon: Why is Steve always late for the bus?
Austin: He's probally having another "Jackception".
by Jooosh Kadszoozk January 13, 2013
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jackatero

person A: HEYYYY JACKATERO
person B: JACKATEROOOOOOO
by penistears July 25, 2021
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Jacademic / Jackademic

Person/People (usually with a university background or a similar form of higher education) who decide to speak in convoluted, very jargon oriented terms about general subjects/topics with the main intent to either: show off their supposed expertise; their superior intellect over their audience; or both.

The main feeling of their audience, however, would typically be "what a long-winded prick..." or a similar negative thought.

Expanding from this, politicians could be described as Jacademics with enhanced convolution and word play abilities.

Term first heard from (Ninja/J-Sel, CoB, 2012)
Professor at dinner party: You know Charles, the stagnant, and you could even say bearish, state of the economy is fundamentally a result of the proliferation of questionable securities and derivatives products offered by major investment banks with the help of their Federal Reserve and Politician friends.

Thought of a general listener: What a Jacademic / Jackademic!
by Realityshow October 18, 2012
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Jackaleaniebeanie

Jackaleaniebeanie is a sexy mofo. Cherish your Jackaleaniebeanie boy, he is someone you don't want to lose.
I love my Jackaleaniebeanie boy <333
by libbysnoot February 23, 2021
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