bom in a key Share definition Flag To put a pinch of chewing tobacco between your gum and cheek. As soon as I finish my Chipotle I'm gonna put a big fat bom in a key, with my favorite Grizzly Wintergreen Longcut. bom in a key by Ben J. L. December 5, 2007 0 0 Get merch Get the bom in a key mug. Buy Now — $32.95 See more merch