If you were not chaotic evil yourself, hearing it would tell you the speaker should be killed, but that is about it.Which would lead me to my next question; what does someone talk about in Chaotic Evil? What does it look/sound like?
Specifically no.Can I walk into a room and realize the guards are talking Lawful Neutral while the chamberlain is talking Neutral Evil?
If you were not chaotic evil yourself, hearing it would tell you the speaker should be killed, but that is about it. Specifically no.
Myself I like the idea:
Good sounds like a Melodic Choir
Evil sounds Mëtäl!
Law sounds Monotonous reading of a bureaucracy textbook hybridized with binary
Chaos sounds like an unintelligible gibberish and mutterings
Dual alignments combine the two elements: Chaotic evil sounds like a record played backwards dripping with foulness.
I think it had its roots in the Black Speech of Middle-Earth, and its counterpart, the various dialects of Elvish and Valar. It got goofy when they decided to make the language literally metaphysic and assume one for each of nine alignments, or even for each of Lawful, Neutral, or Chaotic.