A lisp, also known as sigmatism, is a speech impediment in which a person misarticulates sibilants ([s], [z], [ts], [dz]), ([ʒ], [ʃ], [tʃ], [dʒ]). These misarticulations often result in unclear speech.

https://en.wikipedia.org/wiki/Lisp

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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