When you want to say something you can’t so you switch the word.
NNNNNI slave. You slavish cotton picker. I ACCIDENTALLY had a lisp. Logic 100...
When a very large person breathes heavily over their words making it difficult to understand them.
John: "My name is ahtbajaj."
Me : "What was that? I couldn't understand you through your Polish Lisp."
The lisp you get when you talk while wearing a mouthguard
Person 1: You got your mouthguard for ufc?
Person 2: Yeth, I have my mouthguard for uf -thea. And I covered it in Vatheline.
Person 1: please take out your mouthguard.
Person 2: (takes out mouthguard) Sorry, mouthguard lisp.