Yo mama's so ugly, and her voice is so loud that The X Factor doesn't want or need her to show up to the performances when she sings.
Yo Mama's Ugly Voice
Explanation
Explain Bear
Alright listen up, buttercup. This "yo mama" zinger is all about saying your maternal unit is unpleasant to look at and sounds like trash. It's so bad that even a TV show about singing talent wouldn't want her around. The X Factor is probably too good for you anyway.