Wiktionary
black up
vb. (context intransitive English) To put on blackface makeup.
Wikipedia
Black Up
Black Up is the debut studio album by American hip hop duo Shabazz Palaces. It was released on June 28, 2011 in the United States on Sub Pop. The album was produced by "Knife Knights.plcrs at Gunbeat Serenade Studio in Outplace Palacelands."