Dank is used to describe a person (usually a female) who is extremly...nasty to say the least. This is the kind of person you would never date, talk to, touch, or even get near.
Andrew: Oh my God! That chick smells like an Indian sewer...hell, she looks like one to!!!
Evan: Yeah, shes dank as shit!
"that bitch was so dank that she probably glowed in the dark"
"man, i don't want to go to that part of the city, thats where all of the danks live"
"dude, you don't just go around saying 'dank' like that! that kind of language could get you shanked!"
A girl who like's hard alcohol, dank weed, and big dick. She doesn't take shit from anyone and you will be laughing all the time when around her, she's a great friend unless you piss her off.