You're so bret Share definition Flag To say that someone is so bret is to insult them beyond the point of recover. It is the ultimate diss. You're so bret. It could me that you are so:dumb, idiotic,( or a variety of things ) You're so bret by くりす October 9, 2008 0 0 Get merch Get the You're so bret mug. Buy Now — $32.95 See more merch