Mach Dammit
A fancy way to say you're super fast, and you're probably from the South and you're bragging about it.
I ran across the street before the light even changed. Mach Dammit, I'm a beast.
He sprinted past me like I was a toddler. Mach Dammit, I'm gonna get him next time.
She moved like she had a rocket in her shoes. Mach Dammit, I'm impressed.