Or "Dumb-Ass Nigga Hoe" is a person who is often oblivious to the circumstances going on around them. Someone who doesn't pay a lot of attention, or is just generally stupid.
Girl 1: Oh my god, it's hot outside!
Girl 2: I love your flip-flops.
Girl 1: ... DANH.
Guy 1: How was your night?
Guy 2: Eh, it was ok. I spent it with Kate.
Guy 1: Whaaat? Don't tell me you slept with that DANH.
Guy 2: Why not?
Guy 1: I slept with her once. She tried to paint her nails while we were doing doggy-style.
The common act of creeping on facebook "liking" random girls status' when they have anything to do with partying, drinking, or anything that involves less than normal clothing. Commonly used in the WNY area
Person 1- "Dude, did you see his recent activity?"
person 2- "Yeah, he was totally Danharrising all those chicks"