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1.
The use of two negatives, which cancel each other out.

"a syntactic construction in which two negative words are used in the same clause to express a single negation."

"He didn't say nothing" MEANS- He said something.
"I ain't not never gunna do it" MEANS- I will do it.
"There is not nobody who will go" MEANS- Someone will go.
"I don't want nothing" MEANS- I want something.
"We don't need no education" MEANS- We need education.

If a man did not say nothing, that means he said something.
If a woman does not need NO education, it means that she needs SOME education...
Arlene:You're 20 years old and don't have a job!
Eli:Yeah well i aint not never gunna get one.
Arlene:that's a double negative, you oxymoron!
Eli:Huh? wuss tha?
Arlene:You cancelled yourself out, and made like ur GUNNA get a job...lord knows that aint the truth.
Eli:Stop being such a pansy ass know it all
by g-diggity May 20, 2008
 
2.
The use of two negative words that create improper english.
'we don't need no education'
'yes you do, you just used a double negative!'
by umbrella68 June 14, 2007
 
3.
A mixture of two negative words to create a negative ethos, which actually meakes a positive. A side effect of rapid speech.
"No nothing"

"Don't do nothing"
by Gumba Gumba July 12, 2004
 
4.
To have sex with a minor whose an illegal immigrant, the two negatives make it a positive.
I had sex with a 16 year old latin girl...but shes here illegally, so you know...its a double negative.
by killa beez 101 February 18, 2010