it's a word that can mean whatever you inflect. Typically involved with agreement, it can also be a rallying call. whatever you really want it to, but generally heard in these situations. Invented (or most commonly used) by the hard drinking, hard partying clans of Flagstaff in the Highlands of Northern Irie-Zona (AZ).
Rapper on stage: "How you feeling tonight?!"
928 Character in Crowd: "Yaaaadieeeeee!!!!"
Philbert: "How slave wasted are you right now bud?"