the word said when you preform the mushi finger hold, which is the act of holding one's finger with your pinkie held up, then bringing it down causing a fatal explosion destroying the victim with awesomness.
person 1] noooo! not the mushi finger hold!
person 2] ah, so you heard of this hold?
person 1] *gasp* please!! dont do it!
person 2] skadoosh.