Boii Ask Urban Dictionary about Boii Share definition Flag when you are getting to read to roast somebody and they don't know it's coming. tom:with that uneven hairline Jake:BOII I know you not trying to roast me Boii by jokes and more May 3, 2018 0 0 Boii Merch Get the Boii mug. Buy Now — $32.95 See more merch