If I'm angry I'm fluent as fuck. I think it's cuz when I'm angry I'm focusing on other things other than how I speak so I'm distracted and I don't sabotage myself (by stuttering). Based on my experience stuttering is self-sabotage. It's when you want to say something but at the same time there's a part of you that doesn't. So it makes you block. When ur angry, drunk, or high, ur not focusing on how you sound and thus the stutter disappears.