The above definition is partially correct. The thing where you slide on one foot and spell BLOOD with the other is just one move in Blood walking. Crip walking has a similar move except you cross out Blood after you spell it.
Anyway, Blood walking is a style of dance performed by Bloods which is similar to crippin but with no heel toe or shuffle. It sometimes involves spins and shit. Like the Crip walk has a non-gangsta relative called the clown walk, the Blood walk has a non-gangsta relative called the b-bounce. Both are sick.
Shalltear Bloodfallen (シャルティア・ブラッドフォールン) is a true vampire and the Floor Guardian of the first to third floors in the Great Tomb of Nazarick. She was created by Peroroncino. She is commonly depicted in the Light Novel "Overlord," by Kugane Maruyama, as well as the anime by the same name.
"It can't be helped if you don't know how high the stars are, right? Childish thoughts like being able to touch the stars by reaching out for them are best left for a girl with childish sentiments like Aura. They're disgusting when you hear them coming from an adult." - Shalltear Bloodfallen, to Brain Unglaus.