sharp as a sack of bricks Share definition Flag denotes a real dumbass most often said with a lot of sarcasm & condescension George: "that building is really tall!" Sally: "ahhh, u r about as sharp as a sack of bricks." sharp as a sack of bricks by BrettAndrew May 31, 2006 0 0 Get merch Get the sharp as a sack of bricks mug. Buy Now — $32.95 See more merch