What does cest vrai ou faux mean in English?

it's true, my (N Word).

Mon neg' is very likely to stand for 'mon nègre' in Carribbean French creole, in what case it is an endearing term, used whatever your skin color is, often between husband and wife. It is not used anymore in mainstream French, where it became taboo in the same way that the 'n*gger' did in the US. An exception to that rule is the use of the term by black authors in creole literature.