Adjective
1) Much like how a fly buzzes and bacon sizzles, some weed(good weed) is dank. In this way Dank is a word that is almost onomatopoetic, however, instead of relating to the sound of weed which would be more along the lines of "youknowyouwantto" or possibly "Comeooooonnnnnmaaaannn", dank is the smell of weed perfectly expressed in a single word.
2) Good Weed/Chronic
Examples:
1) "Woooh!! Shit son that shit is dank!"
2) "Yo man wanna get high"
"Fo sho" ....puff.. puff.. pass. "Wo. That shits dank!"
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