look up any word, like bangarang:
 
3.
A guy with a disproportionally large ass. More commonly known as runners butt.
That dudes ass looks way out of proportion compared to the rest of his body. Thats what I call a J-Bro. Dayumn!
by Redlantrn July 08, 2009
 
1.
A derogatory term used to describe:

(1) A spurious bro who tries to fit in with genuine bros, but fails

(2) A poser, wannabe or social climber, often marked by overconfidence

Sometimes used by Anglo-Americans to express ethnic distaste or xenophobia, especially toward Italians, Jews, Eastern Europeans and even Irish

Also slang for jabroni
Bro 1: "Look at that j bro over there, what a wop! Who let him in?"
Bro 2: "I wish I knew. What kind of bro rocks an untucked black button down? And hair gel?!"
Bro 1: "A j bro, obviously. And chinstrap sideburns, to boot!"
by The Brocrastinator December 10, 2009
 
2.
derogatory only in that we could never remember his name.

a.k.a. "Jay", then "'bro", then " J-BRO", "j- b-dub" (jbw), " j-b dub-stylee" (when a sound engineer for ska / reggae band), and "jim-bo".
original response from said character in 1995, "dude, my name is Jim! ..... Uhh..., you know?... James?!

J- bro has been the contraction for at least one male who's name begins with a j and who's name doesn't match up with his face, causing confusion with more than one drunken musician in Boston, while auditioning guitarists in 1995.
" hey j, i can't hear my kick drum" (turn the guitar down)
" j-bro, when are YOU gonna buy some beers?"
"j-b-dub! doin' sound at t.t.'s tonight?"
"Iree!!! dub stylin' j-b-dub's in the house tonight!"
".. whatch you godda do is relax jim-bo!"
by donny of the drummonds September 28, 2011
 
4.
A combination of the words jiggaboo and brother and is used as derogatory word used to talk about a black person.
Look at that jbro over there sagging his pants.
by Jaigermeister August 27, 2007
 
5.
Super awesome computer nerd who loves riding his bike on Thursdays and has freakishly long legs.
See that J Bro over there on his bike! Man, he sure has some long fucking legs!
by Cali Halcy March 21, 2009