Poof Sloop Share definition Flag Any boat piloted by a homosexual. Particularly when they meet in large groups of boats for the annual "Fagatta." There goes another poof sloop. Hope they have a gay old time! Poof Sloop by wifflebird April 23, 2008 0 0 Get merch Get the Poof Sloop mug. Buy Now — $32.95 See more merch