Generally, it's following a character off a stage and hitting them with an aerial move over and over and over every time they try and get back to the stage that can KO someone very easily at a low percentage. That's what I've known it as. Only characters that have multiple jumps and are floaty can do this, maybe Dedede as the exception.
Also, Kirby's air Hammer. Make it one swing and not two, keep the knockback and make it slower, or a speed like the ground hammer. I dunno.
Also, Kirby's air Hammer. Make it one swing and not two, keep the knockback and make it slower, or a speed like the ground hammer. I dunno.