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1.
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
 
2.
Jabroni is really an Italian profanity. It is slang for "ass hole" or "dumb ass"
hey you freakin "Jabroni" whats the matter with you?
by Brian atenco May 25, 2004
 
3.
Put down used by kick-ass wrestler The Rock
Shut your mouth jabroni.
by Gumba Gumba February 22, 2004
 
4.
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".
The Rock says, "Know your role and shut your mouth, jabroni!"
by beau99 May 03, 2010
 
5.
A Jabroni is someone who sucks. Jabroni's are often inferior in skills such as light-sabering, dancing, or playing video games. Jabroni's can not make decent cocktails.
Our roommate is such a Jabroni.
by Lindser Pants Amadeus November 12, 2010
 
6.
A punk/idiot. Someone who you try to avoid. Someone with no redeeming qualities.
Oh hey look it's Pauly c! What a jabroni. We should probably leave.
by Ct860 December 11, 2013
 
7.
A hardcore. Another word for "bro" or Friend.

Vapes like a champion, and doesn't take any shit from others who think Jabroni is derogatory in nature.
Yo, whatsup Jabroni? Want to go get wasted and vape the day away?
by Music_saves_lives August 18, 2014