ARB 

the act of getting a random boner
A Random Boner

Oh shit I just got a terrible ARB

ARB by Elisa294543 February 27, 2011

arb 

short for Protoss Arbiter from the PC game, StarCraft. The flying vessels provide invisibility to surrounding friendly units. They can stasis units to protect them from any and all damage, and can use recall to teleoprt units anywhere on the map.

Holy crap dude, that Arb just recalled 8 Reavers into my minerals.

arb by K Pittman September 21, 2005

ARB 

Apparent Reason Boning. The opposite of NARBing. Boning a chick for a reason.

Man, last night I ARB'd that girl I like.

ARB by Osgrip1931 February 7, 2010

arb 

A little man, who is often extremely anal over his business.
It is usually used as a comparison but it can however be used as a term of endearment for a clever person.

You're more anal than ARB...
or
You're such an ARB

arb by Charlie Thoms February 27, 2004

arb 

African Round Ball aka basketball

Jerome went to play some arb in the projects.

arb by herpn derpn February 8, 2014

Arb 

An epic typo by Mabinogi NA player "archranger" of the Alexina server. This word was meant to be "Narb" but he failed so epicly it turned out as "Arb" and the term slowly developed into the frequently used word we know today, ARB!

1). Eddward is an ARB at cross dressing.

Arb by Refuserishere July 30, 2011

Arb 

When something is so great, it's astounding, remarkable and breathtaking.

Did you see the new LOTR movie? It's arb.

Arb by NotUrbanDictionary July 21, 2017