yes is it, it's so hard to do that I've never posted a video on it. It's an infinite and I know it works on Meta Knight.
What you do is:
Short hop Foot Stool MK
Instantly throw the naner down.
At the top of you jump Fastfall towards MK and grab the banana with Z at the same time.
short hop Foot stool him again
Instantly throw the naner down while holding the Joy stick in the opposite direction he trippedl before
instantly let go the joy stick after the naner is thrown.
fast fall as soon as possible and grab the naner again with z.
Land on the ground and instantly dash towards MK
Footstool him again and repeat all of the previous directions.
The only setup for this I know is if you take 2 naners out trip him with one and then instantly grab the other and run over to him for the footstool