In wrestling: a jobber.
In reality: Dumbass. Loser. A no good son of bitch. Talks a lot of shit but can never back it up.
Calvin: Do wanna pick up some McDonald’s?
Kiff: Sure
*gets to McDonald’s*
Calvin: Dude I forgot my wallet, can you pay for me?
Kiff: you’re a fucking jabroni
by TheRealGeech November 30, 2019
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A loser, poser, lame-ass.

One who talks the talk, but could never walk the walk.

One who talks shit and doesn't back it up, but rather ends up eating their shit in return.

A fuckin 'tard.
Bill: "Hey Bob, you're a big pussy!"
Bob: "oh yeah, well..(breaks Bill's face in half)...who's the fuckin' pussy now you fuckin Jabroni?!"

Damn Jabroni's, I'm always breaking my foot off in their asses!
by The Hunter May 27, 2004
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juh broh nee
–noun
someone who is about to get owned.

-adjective
used to decribe a person or action lacking judgment or sense.
-Love is for jabronies.
-The Rock is about to lay a smack down on that jabronie.
-You locked your keys in the car? Well that was a jabronie thing to do.
by super86me December 7, 2006
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A slang term in professional wrestling first used by the Iron Sheik and then again later by Dwayne "The Rock" Johnson. It is derived from the word jobber, which is someone who routinely loses, or "does the job".
by beau99 May 3, 2010
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Pronounced: Jah-bro-nee
Plural: Jabronis
Pronounced: Jah-bro-nee-ss

Definition:
Jabroni is - to me and maybe some others - is a one-size-fits-all insult. Jabroni can be used to insult anyone for anything. They could be a poser, a lame-ass, a d*ck, an asshole, a motherf*cker, really anything.{1} The pluses to using jabroni over more traditional insults such as the ones listed previously are that it's not used often - giving an enriched and more important and potent insult{2} - and that you can use it for anything as said before. If you're teacher is being just a c*nt, call them a jabroni. He/She will not know what that means, and you can tell them it's a positive thing. Meanwhile everyone else knows that someone just straight-up called them a(n) *INSERT INSULT HERE*.{3}

Origin:
The word jabroni is a new-age insult. It's a new word; we've seen it be created. Origin shows usage from WWE wrestling. Where "The Rock" uses jabroni to describe a "jobber". How some discovered it in the form shown here was from the Vinesauce live streams. The song "The End?" by "The Four Jabronis" is linked here.
{1} "Kyle is such a jabroni."
{2} James: "Hey Donald, you're a f*cking dick."
Donald: "Well James, you're a jabroni!"
James: "Uhh..."
{3} Mr. I. C. Weenur: "Alright ya little s*its, you have to do homework over Spring Break. Read chapter 69 then make a 2 page summary with at least 2,000 words."
Ben: "Mr. Weenur, you're a serious jabroni."
Mr. I. C. Weenur: "What's that?!"
Ben: "A good teacher..."
Mr. I. C. Weenur: "Okay."
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A person who says stupid things all the time, often without knowing how dumb they really sound.

A person that has no idea what is going on around them and asks idiotic questions on a regular basis.
Shut up Jabronie.
by RelapseSAE December 5, 2010
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Used by Mac in Always Sunny. Badass word. A piece of shit. A loose end. And a complete moron.
Mac: We're like a couple jabronis here without skates on.
Charlie: Bro, you keep using this word "jabroni" and it's AWESOME.
by PrinceRoshambo May 19, 2021
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