It's when you take a shit ("Anne Frank"), You don't wipe, and the you spread your butt cheeks and put your partner's nose in your dirty bum hole.
Me: "Oh what's on your face?"
Girl: "My boyfriend gave me The Dirty Anne Frank last night."
Me: "What's that?"
Girl: "Smell my nose."
Girl: "Yeah, shit nose. Imagine how I felt."
Girl: "Yeah kind of."