A combination of two Saturday Night Live alum movie quotes; zang meaning "excellent" according to Mike Myers in Wayne's World, and the redneck dang that David Spade says in Joe Dirt when he thinks something is cool. More punctuated when said in a southern accent like David Spade's character Joe Dirt, better punctuated when the 'a' sound is dragged out and given an extra syllable.
"Zaa-aang! That girl is crazy hot!"
If an intoxicating substance has a zany tang to it, it might be considered to have a 'Zang!'. Also used as a friendly greeting between people who previously taken copious amounts of 'Zang!'-inducing drugs with one another.
This M-Dizzle has a real Zang! to it.
(After snorting a line of MDMA thinking it was coke): "ZANG!!"