furoscious Share definition Flag Slightly hairy rocks that have been caged near a river because when they get wet they will attack. No, those rocks aren't ferocious, they're furoscious. See, one of them is damp and he's grown a little mustache. furoscious by Griisial August 15, 2017 0 0 Get merch Get the furoscious mug. Buy Now — $32.95 See more merch