shutthefuckupcakes Share definition Flag Invisible cupcakes you would verbally serve to a person who will NOT SHUT THE FUCK UP. "Hey motor-mouth, I just baked some SHUTTHEFUCKUPCAKES! Have one!! shutthefuckupcakes by hellzlilangel July 28, 2015 0 0 Get merch Get the shutthefuckupcakes mug. Buy Now — $32.95 See more merch