A blue
dot is a sex offender, often a child molester. The term comes from the
way the majority of neighborhood safety websites display sex offenders in your area (active residence = blue
dot).
Leo: Yo,
fuck is this blue dot shit anyway? Niggas won't shut the fuck up about them fuckin' colors and it's gettin' me mad tight, B.
Omar: Bro, you do not want to go there; that blue dot on the
map? That's old-man Mackenzie's house—he's the pedophile of Fall River. I heard he did some gay shit with one of those big-ass dog dildos.