Heady describes a kava that produces more effects on your mind than on your body. Be it, euphoria, spaciness or just a gentle uplifting to your outlook and sense of well-being. On the other hand, Heavy kavas, can be felt more in your body & muscles and give you an all-around more slow & sedating experience. Balanced kavas do both. But I find most kava to fall closer to one side or the other. The more 'heady'/lighter kava's I've tried, almost always lack in the body/sedating side of the spectrum....and the heavier/body ones are typically somewhat lacking in that light, clean, whimsical contentment you get from the other.