A broad (admittedly corny) way to describe interracial relationships between Africans/African-Americans and Caucasians. Based on the "swirl" ice cream cone, a cone consisting of an equal part of chocolate and vanilla ice cream. Also: WAAAAAAY less offensive than jungle fever. (BTW: Do people still say that? Yikes.)
Person 1: "Hey, Taye Diggs and Idina Menzel got married!"
Person 2: "Oh wow, I didn't know they were down with the swirl."
Person 1: "Uh...ok."