Artist's commentary
Bowsette
Bowsette: "What the heck!? Cut it out!!"
Everyone: "It's too late! Muda muda muda muda muda muda muda muda muda muda muda muda mudaaaaa"
My Patreon:https://www.patreon.com/qblade
Probably a Jojo reference. In this context, muda means "that's impossible".