bun you Share definition Flag The expression of saying 'allow you'....When you can't be bothered with someone....It can also be used as a reply to an insult 1)'Your a waste' 'Bun you!' 2) 'Hey girl can I have your number?' 'Bun you!' bun you by smns February 6, 2009 0 0 Get merch Get the bun you mug. Buy Now — $32.95 See more merch