Mad Big Boos are enemies from Super Princess Peach.
They created their first appearance in Shriek Mansion and were affected and infused by the Vibe Scepter. Their shape is the size of the Big Boo and their vibe is the same as Mad Boo. The color of the Boo is white, with its white teeth, magenta tongue sticking out and light red or light orange eyes. This is one of the variations of Boos.