A dot is a person of one race who lives within a community or society of another race, most commonly African-Americans who live amongst White people ("black dots"). There are also Asians ("yellow dots"), Native Americans ("red dots") and Latinos ("brown dots"). There are also white dots who are caucasians who live in non-white communities.
Man! That Sharice sure likes to act white!
Yo, she can't help it, she grew up a dot (race).