|1.||Black Irish Twins|
Siblings born in the same year to different mothers.
A pun on Irish twins, Black Irish, and the multigenerational deterioration of African-American families.
NB: You don't have to be Black to have a Black Irish Twin.
The other eighth graders thought Dion and Errol were kidding about being "brothers from another mother," but they mean it literally since they were Black Irish Twins.