Oh! I totally forgot that was an improv exercise!
I'm sure alot of improv groups do that but I suspect gibberish came from the Spolin players, right? Does anybody know? Outside of using it as an improv exercise, I used to have ZERO respect for improv gibberish. "Why would someone put that in front of a paying audience?"
Until I saw this video.
https://www.youtube.com/watch?v=Xdina5xyeik
Then I came to realize how much awesome potential it had. Watch more of Gary's videos from those days. Using gibberish highlights the player's emotion & intent. It's about tone. Next time you use gibberish pick ONE THING and
visualize it in your head. See that cat or that piece of cheese and imagine being back at home interacting with it. Make it extremely visceral for you.
NOW perform your monologue about the experience. Really go to your visual memory and connect emotionally. Every time you stumble or lose yourself GO BACK to the visual. Bear hug the memory. It's OK to pause to reflect & connect again. Imagine the object or your intent.
Heck, this is something you can try in front of the mirror right now.
With any exercise, you have to cut to its purpose & strengths. "Why are we doing this exercise?" You might even come across a teacher one day who loses touch with the root of an exercise or game.
Right? So gibberish, I believe, can be very powerful for strengthening & focusing mental imaging. That's a skillset we don't talk about enough.