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2.
Once the name for the chalk like candy that candy hearts are made from, now a term referring to nipples.
"Owww, quit pinching my neccos!"
by Vegetable Man December 07, 2004
 
1.
homeboy; homie; --always said to a close friend that happens to be a white male

In reference to a white person's desire to say "nigga" when talking gansta and for their wafer-like appearance.
"Yo, Tim. What is is?"
"Shit, necco...I'm just trying to mack on these skeezers and skallywags. You know how we do it."
by TallCan211 May 19, 2009