it means that there is a slight chance that it will happen .
it is a possibility.
different from "not ever" meaning never in a lifetime, but "not never" means maybe , maybe not , not saying i never will.
Synonyms for not never
On this page, you will find 30 slang terms related to not never. Some of the top words include: Theeit, antijinxing, Ho-where?, holy holy, Xeiken, and 25 more.