yah heady is not a new slang post-gd-era term. it is actually proper english and used in literature!
Heady
adj : extremely exciting as if by alcohol or a narcotic [syn: intoxicating]
head·y ( P ) Pronunciation Key (hd)
adj. head·i·er, head·i·est
1)
Intoxicating or stupefying: heady liqueur.
Tending to upset the mind or the balance of senses: standing on a heady outcrop of rock.
Serving to exhilarate: the heady news of triumph.
2)
Impetuous and rash: a heady outburst of anger.
Domineering; overbearing: too heady to reason with.
Swift and violent; headlong: a heady current.
Showing intelligence and good judgment; prudent: heady tactics.
Suffering from a headache: a heady, throbbing feeling.
headi·ly adv.
headi·ness n.