Haroo! 

An Irish yell of victory or excitment.

After Brigadier General Thomas R. R. Cobb's Irish Regiment of Georgia pushed back Lieutenant Colonel St. Clair Mullholands Irish Brigade, a Captain (3 stripes on the collar) took off his hat and started yelling "Haroo! Haroo!" and the rest of the regiment cheered "Haroo!"

Haroo! by Jedi_Master June 16, 2008

Haroo 

Used by the gaming community known as the Acolytes. It is used to express something positive that has happened to the community or someone in it.

"We just took down their battlekeep, HAROO!"

Haroo by Hiezu January 28, 2010

Haroo 

An exclimation of excitement or joy.

I found a dime bag on the street. "Haroo," I yelled.

Haroo by Theo Rosenthal January 28, 2007

Haroo 

an exclamation of joy or happieness.
see also "Huzzah"

"Haroo!" yelled the fans as the BALTIMORE RAVENS scored yet another touchdown.

Haroo by Daniel "El Hefe" Posner September 3, 2003

Haroo 

A shortened term of 'how are you'

Hello Mark, Haroo?

Haroo by Collaw July 16, 2010

HARFO 

have a real fine one

Have
A
Real
Fine
One

That is great you are going on vacation next week, HARFO.

HARFO by St. Thomas Aquinas July 27, 2007

Mount Harpo 

The act of having sex with Opray Winfrey and her best friend Gayle at the same time.

OMG! Did you see Dr. Oz and Gayle on the Oprah show yesterday? I totally want to do a Mount Harpo!

Mount Harpo by jl3 April 2, 2009