crack Share definition Flag origin: medsyd: JN2 slang: derived from the crack between the bed (which is morbidly uncomfortable) it means to be shitty or really really bad. Wow, gibbon's attempt at soulja bouy was CRACK! crack by schreibs January 1, 2008 0 0 Get merch Get the crack mug. Buy Now — $32.95 See more merch