A form of jizzing at a much higher rate of speed. Speed jizzing. Where an individual can get off while running or just sitting and vigorously stimulating themselves as much as possible.
"Did you see that guy wearing that bag over his head? He was totally scizzing down the hallway."
When a male experiences overwhelming nervousness and arousal causing him to void his bowels and ejaculate simultaneously.
When a male (usually a nerd) is attempting to have a conversation with an attractive female and becomes so nervous and aroused that he begins shizzing.