gangstanessiosity Share definition Flag Definition of a white boy randomly talking like he's from the hood, usually called a broken fool. "Bill" said fo sho yo, and when I laughed at him, he asked why I had to mock his "gangstanessiosity". gangstanessiosity by Some Silly Girl December 13, 2008 0 0 Get merch Get the gangstanessiosity mug. Buy Now — $32.95 See more merch