I highly elated method of greeting a close friend or relative. Often displayed at barge parties where close friendswill engage specially designed ear woofers and shriek 'Halabasanta' through a mouthpiece in to the other person’s ear. The resonating sound vibrates across the mid section of their parietal lobe which can heighten the experience to such a degree as to cause mild inner scalp chaffing.
Use of the word 'Hallabasanta' can be seen as far back as 2002 when a young B. Kronarbuild first experimented with a normal 'common or garden' toilet roll tube and blerted the word Hallabasanta! in the ear of a unsuspecting friend who has since had to undergo extensive counselling.
A girl who is presented an opportunity to either accept or reject a booty call. Upon accepting, she does in fact lose her right to say, "I aint no hallaback girl."
Mike: "I called her at bar time to come over..."
Richard: "Did she come over?"
Mike: "You know she did. She's a hallaback girl."