dustout in English dictionary dustout Meanings and definitions of "dustout" noun A cloud of dust or duststorm that creates conditions of inadequate visibility. noun A prankster who misleads others by giving false or exaggerated information. noun Fallout; the event of small dust particles falling to the ground in sufficient quantities that they cause a problem. more Grammar and declension of dustout dustout (plural dustouts) more Sample sentences with "dustout" Declension Stem Try again Authors