Philadelphia slang word used to describe a female who is currently attending or graduated from Hallahan High School. Since most of the girls atttending or who have attended Hallahan are from the Roxborough section of Philadelphia the term goes hand and hand with White Trash. They can typically be identified by there giant gold hoop ear rings, trashy highlights, and there strange fondness for oversized plain white T-Shirts.
Hey did you see that group of Hallaho's hanging on the corner of Ridge ave?
by Manayunk Yuppie February 20, 2007