Moving as fast as you possibly can, usually used to describe a medical helicopter flying as fast as they possibly can in order to save a life.
*sound of helicopter overhead*
“Hey? What’s that sound?”
*listening*
“That’s the sound of Metro Life Flight flat ass bookin!”
my ass. It is just a longer part of your back.
Person:What is a flat ass?
Me: My ass.
Something I kinda want because it's weird with guys starting at my butt
Don't hit on her she's got a flat ass 💀