The phrase "sloppy mess" means something that is disorganized and messy.
Sentences with «sloppy mess»
If you don't then it will just be a big sloppy mess. (holisticsquid.com)
My first veggie bean burger was a big floppy sloppy mess and despite tasting pretty good it was a mission to eat! (goodnessgreen.com)
What it does is it smooths out those big bumps and really quiets the ride down while not allowing this vehicle to become a sort of sloppy mess when you need to toss it around a corner or make a lane change. (cnet.com)