jackblammer - A bike term for when you ride so fast you think you're going

A bike term for when you ride so fast you think you're going to die and everyone else is just a sad joke.

I did a jackblammer down the hill and my mom’s dog ran into a tree.

My brother did a jackblammer and broke his bike and his pride.

I did a jackblammer and my dad yelled, 'You're gonna be a ghost!'