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1.
Used to discribe potent bud with an emphasis on dank.
"Damn, that's some diggidy dank!"
by "Big C" June 11, 2008
 
2.
It's true meaning is lost as used by "Mannie the Hippie" who appeared several times on the Letterman show.

It can be used to describe any sitch or piece that you are in full appreciation of.

Michael: "Dude how was the beachburn?"

Ty: "Diggidy dank!"
by STWW October 29, 2006