When one's scalp is incredibly itchy, despite having used Head and Shoulders shampoo and having no dandruff. Usually used in recounting awkward stories.
Man, I had a bad case of blind blizzard during that last meeting.
A man covers his partners eyes with his testicles, blinding them, and then proceeds to shit in his partners mouth.
This is called a blind man's blizzard.
Man it was so fucked last night! I walked in on Johnny giving some chick a blind man's blizzard!