Abbott and Costello did that skit in a movie. They were in a jail with a vagrant and Abbott said “Kokomokomo”
The vagrant looked up and growled “Kokomokomo? Slowly I turned, step by step, inch by inch....”
It was so memorable to my young twisted sense of humor.
LOL!
We used to scare my sister by sneaking up behind her and uttering the words.
That’s another reason my parents forbid us from watching it anymore.