Here are some interesting uses and sources for don't say nothing.
24. Which sentence is written in Standard English? ___________________________
a. Cecilia hasn’t no extra time this term.
b. Holly will not show Cami none of her sketches.
c. We didn’t tell Grant anything about the surprise.
d. Don’t say nothing about the dance to Martin. GrammarUsage201-210
From London Tests of English
DON’T say nothing or very little. Examiners can’t give marks to candidates who don’t speak.____________________________
From the movie Bambi:
Thumper: He doesn't walk very good, does he?____________________________
Mrs. Rabbit: Thumper!
Thumper: Yes, mama?
Mrs. Rabbit: What did your father tell you this morning?
Thumper: [clears throat] If you can't say something nice... don't say nothing at all.
Why do folk just come on to correct other peoples grammar? ... If you don't know what you are taling about - don't say nothing at all! ... BBC SPORT | Euro 2008 blog
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PLEASE, readers... all I ask is that you do a SPELL / GRAMMAR CHECK next time ..... to "If you haven't got something nice to say, don't say nothing at all". ... EP Review: A Thousand Cures